21102001221002 has 32 divisors (see below), whose sum is σ = 34783559712720. Its totient is φ = 9541166469120.

The previous prime is 21102001220987. The next prime is 21102001221023. The reversal of 21102001221002 is 20012210020112.

It can be written as a sum of positive squares in 8 ways, for example, as 7933804523401 + 13168196697601 = 2816701^2 + 3628801^2 .

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, 10672727 + ... + 12494442.

Almost surely, 2^{21102001221002} is an apocalyptic number.

21102001221002 is a deficient number, since it is larger than the sum of its proper divisors (13681558491718).

21102001221002 is a wasteful number, since it uses less digits than its factorization.

21102001221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23167898.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102001221002 its reverse (20012210020112), we get a palindrome (41114211241114).

The spelling of 21102001221002 in words is "twenty-one trillion, one hundred two billion, one million, two hundred twenty-one thousand, two".