21202120220120 has 64 divisors (see below), whose sum is σ = 57726781116480. Its totient is φ = 6841692573696.

The previous prime is 21202120220117. The next prime is 21202120220173. The reversal of 21202120220120 is 2102202120212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

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, 2227108709 + ... + 2227118228.

It is an arithmetic number, because the mean of its divisors is an integer number (901980954945).

Almost surely, 2^{21202120220120} is an apocalyptic number.

21202120220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202120220120 is an abundant number, since it is smaller than the sum of its proper divisors (36524660896360).

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

21202120220120 is a wasteful number, since it uses less digits than its factorization.

21202120220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454226972 (or 4454226968 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202120220120 its reverse (2102202120212), we get a palindrome (23304322340332).

The spelling of 21202120220120 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, two hundred twenty thousand, one hundred twenty".