21001002212210 has 16 divisors (see below), whose sum is σ = 37806362409816. Its totient is φ = 8399387900928.

The previous prime is 21001002212207. The next prime is 21001002212279. The reversal of 21001002212210 is 1221220010012.

It can be written as a sum of positive squares in 4 ways, for example, as 13455493157929 + 7545509054281 = 3668173^2 + 2746909^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126535919 + ... + 126701778.

Almost surely, 2^{21001002212210} is an apocalyptic number.

21001002212210 is a deficient number, since it is larger than the sum of its proper divisors (16805360197606).

21001002212210 is a wasteful number, since it uses less digits than its factorization.

21001002212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253245997.

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

Adding to 21001002212210 its reverse (1221220010012), we get a palindrome (22222222222222).

The spelling of 21001002212210 in words is "twenty-one trillion, one billion, two million, two hundred twelve thousand, two hundred ten".