84268556621 has 4 divisors (see below), whose sum is σ = 84388769244. Its totient is φ = 84148344000.

The previous prime is 84268556573. The next prime is 84268556633. The reversal of 84268556621 is 12665586248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55785243721 + 28483312900 = 236189^2 + 168770^2 .

It is a cyclic number.

It is not a de Polignac number, because 84268556621 - 2⁶ = 84268556557 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 (84268556641) 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, 60105260 + ... + 60106661.

It is an arithmetic number, because the mean of its divisors is an integer number (21097192311).

Almost surely, 2^84268556621 is an apocalyptic number.

It is an amenable number.

84268556621 is a deficient number, since it is larger than the sum of its proper divisors (120212623).

84268556621 is a wasteful number, since it uses less digits than its factorization.

84268556621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120212622.

The product of its digits is 5529600, while the sum is 53.

The spelling of 84268556621 in words is "eighty-four billion, two hundred sixty-eight million, five hundred fifty-six thousand, six hundred twenty-one".