84951951021 has 12 divisors (see below), whose sum is σ = 140238141472. Its totient is φ = 48543971976.

The previous prime is 84951950987. The next prime is 84951951037. The reversal of 84951951021 is 12015915948.

84951951021 is a `hidden beast` number, since 84 + 9 + 51 + 9 + 510 + 2 + 1 = 666.

It is not a de Polignac number, because 84951951021 - 2⁹ = 84951950509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84951951041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 674221771 + ... + 674221896.

Almost surely, 2^84951951021 is an apocalyptic number.

It is an amenable number.

84951951021 is a deficient number, since it is larger than the sum of its proper divisors (55286190451).

84951951021 is a wasteful number, since it uses less digits than its factorization.

84951951021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348443680 (or 1348443677 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The spelling of 84951951021 in words is "eighty-four billion, nine hundred fifty-one million, nine hundred fifty-one thousand, twenty-one".