1021000020120 has 160 divisors (see below), whose sum is σ = 3542394683520. Its totient is φ = 263483850240.

The previous prime is 1021000020077. The next prime is 1021000020137. The reversal of 1021000020120 is 210200001201.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4982197 + ... + 5183076.

It is an arithmetic number, because the mean of its divisors is an integer number (22139966772).

Almost surely, 2^{1021000020120} is an apocalyptic number.

1021000020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021000020120 is an abundant number, since it is smaller than the sum of its proper divisors (2521394663400).

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

1021000020120 is a wasteful number, since it uses less digits than its factorization.

1021000020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10165327 (or 10165314 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1021000020120 its reverse (210200001201), we get a palindrome (1231200021321).

The spelling of 1021000020120 in words is "one trillion, twenty-one billion, twenty thousand, one hundred twenty".