21202011012120 has 64 divisors (see below), whose sum is σ = 67347564397920. Its totient is φ = 5321289037824.

The previous prime is 21202011012109. The next prime is 21202011012121. The reversal of 21202011012120 is 2121011020212.

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 21202011012120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202011012121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5196569287 + ... + 5196573366.

Almost surely, 2^{21202011012120} is an apocalyptic number.

21202011012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202011012120 is an abundant number, since it is smaller than the sum of its proper divisors (46145553385800).

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

21202011012120 is a wasteful number, since it uses less digits than its factorization.

21202011012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10393142684 (or 10393142680 counting only the distinct ones).

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

Adding to 21202011012120 its reverse (2121011020212), we get a palindrome (23323022032332).

The spelling of 21202011012120 in words is "twenty-one trillion, two hundred two billion, eleven million, twelve thousand, one hundred twenty".