21211220010 has 64 divisors (see below), whose sum is σ = 51497576064. Its totient is φ = 5591040000.

The previous prime is 21211219973. The next prime is 21211220021. The reversal of 21211220010 is 1002211212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999510 + ... + 1020510.

It is an arithmetic number, because the mean of its divisors is an integer number (804649626).

Almost surely, 2^21211220010 is an apocalyptic number.

21211220010 is an abundant number, since it is smaller than the sum of its proper divisors (30286356054).

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

21211220010 is a wasteful number, since it uses less digits than its factorization.

21211220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21399.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21211220010 its reverse (1002211212), we get a palindrome (22213431222).

The spelling of 21211220010 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, ten".