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1120021 = 743612
BaseRepresentation
bin100010001011100010101
32002220101021
410101130111
5241320041
640001141
712343240
oct4213425
92086337
101120021
116a5541
124601b1
13302a46
14212257
15171cd1
hex111715

1120021 has 12 divisors (see below), whose sum is σ = 1331616. Its totient is φ = 922320.

The previous prime is 1120019. The next prime is 1120051. The reversal of 1120021 is 1200211.

It is not a de Polignac number, because 1120021 - 21 = 1120019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1119986 and 1120013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120001) 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, 18331 + ... + 18391.

It is an arithmetic number, because the mean of its divisors is an integer number (110968).

21120021 is an apocalyptic number.

It is an amenable number.

1120021 is a deficient number, since it is larger than the sum of its proper divisors (211595).

1120021 is an frugal number, since it uses more digits than its factorization.

1120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1120021 is about 1058.3104459467. The cubic root of 1120021 is about 103.8505310947.

Adding to 1120021 its reverse (1200211), we get a palindrome (2320232).

The spelling of 1120021 in words is "one million, one hundred twenty thousand, twenty-one".

Divisors: 1 7 43 61 301 427 2623 3721 18361 26047 160003 1120021