21210120102120 has 128 divisors (see below), whose sum is σ = 65559420714240. Its totient is φ = 5487100323840.

The previous prime is 21210120102071. The next prime is 21210120102151. The reversal of 21210120102120 is 2120102101212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21210120102120.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19311924 + ... + 20380643.

It is an arithmetic number, because the mean of its divisors is an integer number (512182974330).

Almost surely, 2^{21210120102120} is an apocalyptic number.

21210120102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210120102120 is an abundant number, since it is smaller than the sum of its proper divisors (44349300612120).

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

21210120102120 is a wasteful number, since it uses less digits than its factorization.

21210120102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39692715 (or 39692711 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210120102120 its reverse (2120102101212), we get a palindrome (23330222203332).

The spelling of 21210120102120 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred two thousand, one hundred twenty".