68990221 has 4 divisors (see below), whose sum is σ = 71215744. Its totient is φ = 66764700.

The previous prime is 68990191. The next prime is 68990227. The reversal of 68990221 is 12209986.

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 not a de Polignac number, because 68990221 - 2¹¹ = 68988173 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 (68990227) 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, 1112715 + ... + 1112776.

It is an arithmetic number, because the mean of its divisors is an integer number (17803936).

Almost surely, 2^68990221 is an apocalyptic number.

It is an amenable number.

68990221 is a deficient number, since it is larger than the sum of its proper divisors (2225523).

68990221 is a wasteful number, since it uses less digits than its factorization.

68990221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225522.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 68990221 is about 8306.0352154322. The cubic root of 68990221 is about 410.1372156233.

The spelling of 68990221 in words is "sixty-eight million, nine hundred ninety thousand, two hundred twenty-one".