21210321012120 has 48 divisors (see below), whose sum is σ = 68933543290560. Its totient is φ = 5656085603136.

The previous prime is 21210321012119. The next prime is 21210321012143. The reversal of 21210321012120 is 2121012301212.

21210321012120 is a `hidden beast` number, since 2 + 1 + 210 + 321 + 0 + 12 + 120 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21210321012093 and 21210321012102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29458778824 + ... + 29458779543.

It is an arithmetic number, because the mean of its divisors is an integer number (1436115485220).

Almost surely, 2^{21210321012120} is an apocalyptic number.

21210321012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210321012120 is an abundant number, since it is smaller than the sum of its proper divisors (47723222278440).

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

21210321012120 is a wasteful number, since it uses less digits than its factorization.

21210321012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58917558384 (or 58917558377 counting only the distinct ones).

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

Adding to 21210321012120 its reverse (2121012301212), we get a palindrome (23331333313332).

The spelling of 21210321012120 in words is "twenty-one trillion, two hundred ten billion, three hundred twenty-one million, twelve thousand, one hundred twenty".