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202121001 = 342495321
BaseRepresentation
bin11000000110000…
…01111100101001
3112002022210220000
430003001330221
5403220333001
632020053213
75003000025
oct1403017451
9462283800
10202121001
11a4101555
1257834209
1332b4a834
141cbb5385
1512b27a86
hexc0c1f29

202121001 has 10 divisors (see below), whose sum is σ = 301933962. Its totient is φ = 134747280.

The previous prime is 202120979. The next prime is 202121053. The reversal of 202121001 is 100121202.

It can be written as a sum of positive squares in only one way, i.e., 114511401 + 87609600 = 10701^2 + 9360^2 .

It is not a de Polignac number, because 202121001 - 25 = 202120969 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (202121081) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1247580 + ... + 1247741.

Almost surely, 2202121001 is an apocalyptic number.

It is an amenable number.

202121001 is a deficient number, since it is larger than the sum of its proper divisors (99812961).

202121001 is an equidigital number, since it uses as much as digits as its factorization.

202121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495333 (or 2495324 counting only the distinct ones).

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

The square root of 202121001 is about 14216.9265665966. The cubic root of 202121001 is about 586.8635640679.

Adding to 202121001 its reverse (100121202), we get a palindrome (302242203).

The spelling of 202121001 in words is "two hundred two million, one hundred twenty-one thousand, one".

Divisors: 1 3 9 27 81 2495321 7485963 22457889 67373667 202121001