21213210120120 has 48 divisors (see below), whose sum is σ = 68942932891560. Its totient is φ = 5656856031936.

The previous prime is 21213210120079. The next prime is 21213210120149. The reversal of 21213210120120 is 2102101231212.

21213210120120 is a `hidden beast` number, since 2 + 1 + 213 + 210 + 120 + 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 = 21213210120093 and 21213210120102.

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, 29462791474 + ... + 29462792193.

Almost surely, 2^{21213210120120} is an apocalyptic number.

21213210120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213210120120 is an abundant number, since it is smaller than the sum of its proper divisors (47729722771440).

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

21213210120120 is a wasteful number, since it uses less digits than its factorization.

21213210120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58925583684 (or 58925583677 counting only the distinct ones).

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

Adding to 21213210120120 its reverse (2102101231212), we get a palindrome (23315311351332).

The spelling of 21213210120120 in words is "twenty-one trillion, two hundred thirteen billion, two hundred ten million, one hundred twenty thousand, one hundred twenty".