85221157 has 4 divisors (see below), whose sum is σ = 97395616. Its totient is φ = 73046700.

The previous prime is 85221107. The next prime is 85221197. The reversal of 85221157 is 75112258.

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 85221157 - 2⁷ = 85221029 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 (85221107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6087219 + ... + 6087232.

It is an arithmetic number, because the mean of its divisors is an integer number (24348904).

Almost surely, 2^85221157 is an apocalyptic number.

It is an amenable number.

85221157 is a deficient number, since it is larger than the sum of its proper divisors (12174459).

85221157 is a wasteful number, since it uses less digits than its factorization.

85221157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12174458.

The product of its digits is 5600, while the sum is 31.

The square root of 85221157 is about 9231.5305881528. The cubic root of 85221157 is about 440.0639662512.

The spelling of 85221157 in words is "eighty-five million, two hundred twenty-one thousand, one hundred fifty-seven".