68889021 has 4 divisors (see below), whose sum is σ = 91852032. Its totient is φ = 45926012.

The previous prime is 68889019. The next prime is 68889031. The reversal of 68889021 is 12098886.

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 68889021 - 2¹ = 68889019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68889031) 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, 11481501 + ... + 11481506.

It is an arithmetic number, because the mean of its divisors is an integer number (22963008).

Almost surely, 2^68889021 is an apocalyptic number.

It is an amenable number.

68889021 is a deficient number, since it is larger than the sum of its proper divisors (22963011).

68889021 is a wasteful number, since it uses less digits than its factorization.

68889021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22963010.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 68889021 is about 8299.9410238869. The cubic root of 68889021 is about 409.9365775386.

The spelling of 68889021 in words is "sixty-eight million, eight hundred eighty-nine thousand, twenty-one".