1021874792220 has 72 divisors (see below), whose sum is σ = 3175289011440. Its totient is φ = 265853602560.

The previous prime is 1021874792201. The next prime is 1021874792227. The reversal of 1021874792220 is 222974781201.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021874792227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69225330 + ... + 69240089.

It is an arithmetic number, because the mean of its divisors is an integer number (44101236270).

Almost surely, 2^{1021874792220} is an apocalyptic number.

1021874792220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021874792220 is an abundant number, since it is smaller than the sum of its proper divisors (2153414219220).

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

1021874792220 is a wasteful number, since it uses less digits than its factorization.

1021874792220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138465475 (or 138465470 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 1021874792220 in words is "one trillion, twenty-one billion, eight hundred seventy-four million, seven hundred ninety-two thousand, two hundred twenty".