84574051017921 has 10 divisors (see below), whose sum is σ = 126339014483682. Its totient is φ = 56382700678560.

The previous prime is 84574051017917. The next prime is 84574051017941. The reversal of 84574051017921 is 12971015047548.

84574051017921 is a `hidden beast` number, since 8 + 4 + 57 + 4 + 0 + 510 + 1 + 79 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58590819127296 + 25983231890625 = 7654464^2 + 5097375^2 .

It is not a de Polignac number, because 84574051017921 - 2² = 84574051017917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84574051017941) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 522062043240 + ... + 522062043401.

Almost surely, 2^{84574051017921} is an apocalyptic number.

84574051017921 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

84574051017921 is a deficient number, since it is larger than the sum of its proper divisors (41764963465761).

84574051017921 is a wasteful number, since it uses less digits than its factorization.

84574051017921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044124086653 (or 1044124086644 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 84574051017921 in words is "eighty-four trillion, five hundred seventy-four billion, fifty-one million, seventeen thousand, nine hundred twenty-one".