21020102010120 has 64 divisors (see below), whose sum is σ = 63082901197440. Its totient is φ = 5603352076800.

The previous prime is 21020102010109. The next prime is 21020102010181. The reversal of 21020102010120 is 2101020102012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21020102010096 and 21020102010105.

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, 31045861 + ... + 31715700.

It is an arithmetic number, because the mean of its divisors is an integer number (985670331210).

Almost surely, 2^{21020102010120} is an apocalyptic number.

21020102010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020102010120 is an abundant number, since it is smaller than the sum of its proper divisors (42062799187320).

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

21020102010120 is a wasteful number, since it uses less digits than its factorization.

21020102010120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62764366 (or 62764362 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020102010120 its reverse (2101020102012), we get a palindrome (23121122112132).

The spelling of 21020102010120 in words is "twenty-one trillion, twenty billion, one hundred two million, ten thousand, one hundred twenty".