21010120010 has 64 divisors (see below), whose sum is σ = 44351815680. Its totient is φ = 7083904320.

The previous prime is 21010120003. The next prime is 21010120031. The reversal of 21010120010 is 1002101012.

It is a self number, because there is not a number n which added to its sum of digits gives 21010120010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8714 + ... + 205173.

It is an arithmetic number, because the mean of its divisors is an integer number (692997120).

Almost surely, 2^21010120010 is an apocalyptic number.

21010120010 is an abundant number, since it is smaller than the sum of its proper divisors (23341695670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010120010 is a wasteful number, since it uses less digits than its factorization.

21010120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213971.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21010120010 its reverse (1002101012), we get a palindrome (22012221022).

The spelling of 21010120010 in words is "twenty-one billion, ten million, one hundred twenty thousand, ten".