85107802921 has 4 divisors (see below), whose sum is σ = 85249413844. Its totient is φ = 84966192000.

The previous prime is 85107802891. The next prime is 85107802937. The reversal of 85107802921 is 12920870158.

It is a happy number.

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 56328376896 + 28779426025 = 237336^2 + 169645^2 .

It is a cyclic number.

It is not a de Polignac number, because 85107802921 - 2²⁹ = 84570932009 is a prime.

It is a super-2 number, since 2×85107802921² (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 (85107802991) 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, 70804560 + ... + 70805761.

It is an arithmetic number, because the mean of its divisors is an integer number (21312353461).

Almost surely, 2^85107802921 is an apocalyptic number.

It is an amenable number.

85107802921 is a deficient number, since it is larger than the sum of its proper divisors (141610923).

85107802921 is a wasteful number, since it uses less digits than its factorization.

85107802921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141610922.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 85107802921 in words is "eighty-five billion, one hundred seven million, eight hundred two thousand, nine hundred twenty-one".