84212500921 has 4 divisors (see below), whose sum is σ = 84682962000. Its totient is φ = 83742039844.

The previous prime is 84212500913. The next prime is 84212500949. The reversal of 84212500921 is 12900521248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84212500921 - 2³ = 84212500913 is a prime.

It is a super-2 number, since 2×84212500921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84212530921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235230271 + ... + 235230628.

It is an arithmetic number, because the mean of its divisors is an integer number (21170740500).

Almost surely, 2^84212500921 is an apocalyptic number.

It is an amenable number.

84212500921 is a deficient number, since it is larger than the sum of its proper divisors (470461079).

84212500921 is a wasteful number, since it uses less digits than its factorization.

84212500921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470461078.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 84212500921 in words is "eighty-four billion, two hundred twelve million, five hundred thousand, nine hundred twenty-one".