21210203211210 has 48 divisors (see below), whose sum is σ = 59388568994664. Its totient is φ = 5220973097856.

The previous prime is 21210203211193. The next prime is 21210203211221. The reversal of 21210203211210 is 1211230201212.

21210203211210 is a `hidden beast` number, since 21 + 21 + 0 + 203 + 211 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15618912613929 + 5591290597281 = 3952077^2 + 2364591^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9064188237 + ... + 9064190576.

Almost surely, 2^{21210203211210} is an apocalyptic number.

21210203211210 is an abundant number, since it is smaller than the sum of its proper divisors (38178365783454).

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

21210203211210 is a wasteful number, since it uses less digits than its factorization.

21210203211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18128378839 (or 18128378836 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21210203211210 its reverse (1211230201212), we get a palindrome (22421433412422).

The spelling of 21210203211210 in words is "twenty-one trillion, two hundred ten billion, two hundred three million, two hundred eleven thousand, two hundred ten".