21020210121010 has 16 divisors (see below), whose sum is σ = 37836494092800. Its totient is φ = 8408058298416.

The previous prime is 21020210120989. The next prime is 21020210121019. The reversal of 21020210121010 is 1012101202012.

It is a super-2 number, since 2×21020210121010² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020210121019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403951 + ... + 6496429.

It is an arithmetic number, because the mean of its divisors is an integer number (2364780880800).

Almost surely, 2^{21020210121010} is an apocalyptic number.

21020210121010 is a deficient number, since it is larger than the sum of its proper divisors (16816283971790).

21020210121010 is a wasteful number, since it uses less digits than its factorization.

21020210121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6437505.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21020210121010 its reverse (1012101202012), we get a palindrome (22032311323022).

The spelling of 21020210121010 in words is "twenty-one trillion, twenty billion, two hundred ten million, one hundred twenty-one thousand, ten".