21112020112210 has 32 divisors (see below), whose sum is σ = 38945136155184. Its totient is φ = 8235317376000.

The previous prime is 21112020112147. The next prime is 21112020112241. The reversal of 21112020112210 is 1221102021112.

It can be written as a sum of positive squares in 8 ways, for example, as 6300767677689 + 14811252434521 = 2510133^2 + 3848539^2 .

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, 10038211 + ... + 11957830.

Almost surely, 2^{21112020112210} is an apocalyptic number.

21112020112210 is a deficient number, since it is larger than the sum of its proper divisors (17833116042974).

21112020112210 is a wasteful number, since it uses less digits than its factorization.

21112020112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21998430.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21112020112210 its reverse (1221102021112), we get a palindrome (22333122133322).

The spelling of 21112020112210 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred twelve thousand, two hundred ten".