21001212112010 has 24 divisors (see below), whose sum is σ = 40933723492620. Its totient is φ = 7754293702272.

The previous prime is 21001212112007. The next prime is 21001212112063. The reversal of 21001212112010 is 1021121210012.

It can be written as a sum of positive squares in 6 ways, for example, as 1632243873649 + 19368968238361 = 1277593^2 + 4401019^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6213374675 + ... + 6213378054.

Almost surely, 2^{21001212112010} is an apocalyptic number.

21001212112010 is a deficient number, since it is larger than the sum of its proper divisors (19932511380610).

21001212112010 is a wasteful number, since it uses less digits than its factorization.

21001212112010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12426752762 (or 12426752749 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001212112010 its reverse (1021121210012), we get a palindrome (22022333322022).

The spelling of 21001212112010 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred twelve thousand, ten".