21210313212120 has 32 divisors (see below), whose sum is σ = 63630939636720. Its totient is φ = 5656083523200.

The previous prime is 21210313212059. The next prime is 21210313212161. The reversal of 21210313212120 is 2121231301212.

It is a super-2 number, since 2×21210313212120² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 88376304931 + ... + 88376305170.

Almost surely, 2^{21210313212120} is an apocalyptic number.

21210313212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210313212120 is an abundant number, since it is smaller than the sum of its proper divisors (42420626424600).

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

21210313212120 is a wasteful number, since it uses less digits than its factorization.

21210313212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176752610115 (or 176752610111 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21210313212120 its reverse (2121231301212), we get a palindrome (23331544513332).

The spelling of 21210313212120 in words is "twenty-one trillion, two hundred ten billion, three hundred thirteen million, two hundred twelve thousand, one hundred twenty".