21020010120231 has 16 divisors (see below), whose sum is σ = 29684065010400. Its totient is φ = 13185134133248.

The previous prime is 21020010120217. The next prime is 21020010120253. The reversal of 21020010120231 is 13202101002012.

It is a cyclic number.

It is not a de Polignac number, because 21020010120231 - 2¹³ = 21020010112039 is a prime.

It is a super-2 number, since 2×21020010120231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21020010120231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020010120271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60635226 + ... + 60980903.

It is an arithmetic number, because the mean of its divisors is an integer number (1855254063150).

Almost surely, 2^{21020010120231} is an apocalyptic number.

21020010120231 is a deficient number, since it is larger than the sum of its proper divisors (8664054890169).

21020010120231 is a wasteful number, since it uses less digits than its factorization.

21020010120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121619538.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21020010120231 its reverse (13202101002012), we get a palindrome (34222111122243).

The spelling of 21020010120231 in words is "twenty-one trillion, twenty billion, ten million, one hundred twenty thousand, two hundred thirty-one".