84272212921 has 8 divisors (see below), whose sum is σ = 90932997960. Its totient is φ = 77636900352.

The previous prime is 84272212919. The next prime is 84272212939. The reversal of 84272212921 is 12921227248.

It can be written as a sum of positive squares in 4 ways, for example, as 1710236025 + 82561976896 = 41355^2 + 287336^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84272212921 - 2¹ = 84272212919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84272216921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6361240 + ... + 6374473.

It is an arithmetic number, because the mean of its divisors is an integer number (11366624745).

Almost surely, 2^84272212921 is an apocalyptic number.

It is an amenable number.

84272212921 is a deficient number, since it is larger than the sum of its proper divisors (6660785039).

84272212921 is a wasteful number, since it uses less digits than its factorization.

84272212921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12736235.

The product of its digits is 64512, while the sum is 40.

The spelling of 84272212921 in words is "eighty-four billion, two hundred seventy-two million, two hundred twelve thousand, nine hundred twenty-one".