84697572321 has 20 divisors (see below), whose sum is σ = 126543927664. Its totient is φ = 56455947000.

The previous prime is 84697572319. The next prime is 84697572383. The reversal of 84697572321 is 12327579648.

It is a happy number.

84697572321 is a `hidden beast` number, since 8 + 4 + 69 + 7 + 572 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 84697572321 - 2¹ = 84697572319 is a prime.

It is a super-4 number, since 4×84697572321⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84697572301) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 441486 + ... + 603576.

Almost surely, 2^84697572321 is an apocalyptic number.

84697572321 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

84697572321 is a deficient number, since it is larger than the sum of its proper divisors (41846355343).

84697572321 is a wasteful number, since it uses less digits than its factorization.

84697572321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168554 (or 168545 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 84697572321 in words is "eighty-four billion, six hundred ninety-seven million, five hundred seventy-two thousand, three hundred twenty-one".