21121012010 has 32 divisors (see below), whose sum is σ = 45338026752. Its totient is φ = 6926641920.

The previous prime is 21121011959. The next prime is 21121012021. The reversal of 21121012010 is 1021012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121011982 and 21121012000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6557711 + ... + 6560930.

It is an arithmetic number, because the mean of its divisors is an integer number (1416813336).

Almost surely, 2^21121012010 is an apocalyptic number.

21121012010 is an abundant number, since it is smaller than the sum of its proper divisors (24217014742).

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

21121012010 is a wasteful number, since it uses less digits than its factorization.

21121012010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13118678.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121012010 its reverse (1021012112), we get a palindrome (22142024122).

The spelling of 21121012010 in words is "twenty-one billion, one hundred twenty-one million, twelve thousand, ten".