210021213122120 has 64 divisors (see below), whose sum is σ = 480332240630640. Its totient is φ = 82624789094400.

The previous prime is 210021213122117. The next prime is 210021213122131. The reversal of 210021213122120 is 21221312120012.

It can be written as a sum of positive squares in 8 ways, for example, as 141455294676004 + 68565918446116 = 11893498^2 + 8280454^2 .

It is a super-2 number, since 2×210021213122120² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 210021213122092 and 210021213122101.

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, 27656084 + ... + 34422396.

Almost surely, 2^{210021213122120} is an apocalyptic number.

210021213122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021213122120 is an abundant number, since it is smaller than the sum of its proper divisors (270311027508520).

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

210021213122120 is a wasteful number, since it uses less digits than its factorization.

210021213122120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779106 (or 6779102 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 210021213122120 its reverse (21221312120012), we get a palindrome (231242525242132).

The spelling of 210021213122120 in words is "two hundred ten trillion, twenty-one billion, two hundred thirteen million, one hundred twenty-two thousand, one hundred twenty".