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112020021 = 3217732157
BaseRepresentation
bin1101010110101…
…00101000110101
321210210012120200
412223110220311
5212134120041
615040551113
72530103661
oct653245065
9253705520
10112020021
1158261333
1231622499
131a291949
1410c3d8a1
159c7b1b6
hex6ad4a35

112020021 has 12 divisors (see below), whose sum is σ = 171324972. Its totient is φ = 70286976.

The previous prime is 112019993. The next prime is 112020043. The reversal of 112020021 is 120020211.

It can be written as a sum of positive squares in 2 ways, for example, as 68657796 + 43362225 = 8286^2 + 6585^2 .

It is not a de Polignac number, because 112020021 - 213 = 112011829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 112019985 and 112020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112020061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 365926 + ... + 366231.

It is an arithmetic number, because the mean of its divisors is an integer number (14277081).

Almost surely, 2112020021 is an apocalyptic number.

It is an amenable number.

112020021 is a deficient number, since it is larger than the sum of its proper divisors (59304951).

112020021 is a wasteful number, since it uses less digits than its factorization.

112020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732180 (or 732177 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 112020021 is about 10583.9511053292. The cubic root of 112020021 is about 482.0571734204.

Adding to 112020021 its reverse (120020211), we get a palindrome (232040232).

The spelling of 112020021 in words is "one hundred twelve million, twenty thousand, twenty-one".

Divisors: 1 3 9 17 51 153 732157 2196471 6589413 12446669 37340007 112020021