21000311221010 has 32 divisors (see below), whose sum is σ = 41257419904512. Its totient is φ = 7632690670080.

The previous prime is 21000311220979. The next prime is 21000311221051. The reversal of 21000311221010 is 1012211300012.

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, 47103842 + ... + 47547581.

It is an arithmetic number, because the mean of its divisors is an integer number (1289294372016).

Almost surely, 2^{21000311221010} is an apocalyptic number.

21000311221010 is a deficient number, since it is larger than the sum of its proper divisors (20257108683502).

21000311221010 is a wasteful number, since it uses less digits than its factorization.

21000311221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94653458.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21000311221010 its reverse (1012211300012), we get a palindrome (22012522521022).

The spelling of 21000311221010 in words is "twenty-one trillion, three hundred eleven million, two hundred twenty-one thousand, ten".