85620921 has 4 divisors (see below), whose sum is σ = 114161232. Its totient is φ = 57080612.

The previous prime is 85620919. The next prime is 85620929. The reversal of 85620921 is 12902658.

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 85620921 - 2¹ = 85620919 is a prime.

It is a super-2 number, since 2×85620921² = 14661884225776482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85620929) 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, 14270151 + ... + 14270156.

It is an arithmetic number, because the mean of its divisors is an integer number (28540308).

Almost surely, 2^85620921 is an apocalyptic number.

It is an amenable number.

85620921 is a deficient number, since it is larger than the sum of its proper divisors (28540311).

85620921 is a wasteful number, since it uses less digits than its factorization.

85620921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28540310.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 85620921 is about 9253.1573530336. The cubic root of 85620921 is about 440.7509919269.

The spelling of 85620921 in words is "eighty-five million, six hundred twenty thousand, nine hundred twenty-one".