21213133342120 has 16 divisors (see below), whose sum is σ = 47729550019860. Its totient is φ = 8485253336832.

The previous prime is 21213133342111. The next prime is 21213133342213. The reversal of 21213133342120 is 2124333131212.

It can be written as a sum of positive squares in 2 ways, for example, as 21153026974564 + 60106367556 = 4599242^2 + 245166^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265164166737 + ... + 265164166816.

Almost surely, 2^{21213133342120} is an apocalyptic number.

21213133342120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213133342120 is an abundant number, since it is smaller than the sum of its proper divisors (26516416677740).

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

21213133342120 is a wasteful number, since it uses less digits than its factorization.

21213133342120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530328333564 (or 530328333560 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21213133342120 its reverse (2124333131212), we get a palindrome (23337466473332).

The spelling of 21213133342120 in words is "twenty-one trillion, two hundred thirteen billion, one hundred thirty-three million, three hundred forty-two thousand, one hundred twenty".