20000021012120 has 128 divisors (see below), whose sum is σ = 46827490348800. Its totient is φ = 7682214912000.

The previous prime is 20000021011991. The next prime is 20000021012141. The reversal of 20000021012120 is 2121012000002.

It is a happy number.

It is a congruent number.

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, 45769226 + ... + 46204134.

It is an arithmetic number, because the mean of its divisors is an integer number (365839768350).

Almost surely, 2^{20000021012120} is an apocalyptic number.

20000021012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000021012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23413745174400).

20000021012120 is an abundant number, since it is smaller than the sum of its proper divisors (26827469336680).

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

20000021012120 is a wasteful number, since it uses less digits than its factorization.

20000021012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435429 (or 435425 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20000021012120 its reverse (2121012000002), we get a palindrome (22121033012122).

The spelling of 20000021012120 in words is "twenty trillion, twenty-one million, twelve thousand, one hundred twenty".