68942421 has 20 divisors (see below), whose sum is σ = 103428864. Its totient is φ = 45765000.

The previous prime is 68942417. The next prime is 68942437. The reversal of 68942421 is 12424986.

It is not a de Polignac number, because 68942421 - 2² = 68942417 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68942411) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18636 + ... + 22026.

Almost surely, 2^68942421 is an apocalyptic number.

It is an amenable number.

68942421 is a deficient number, since it is larger than the sum of its proper divisors (34486443).

68942421 is a wasteful number, since it uses less digits than its factorization.

68942421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654 (or 3645 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 68942421 is about 8303.1572910550. The cubic root of 68942421 is about 410.0424723005.

The spelling of 68942421 in words is "sixty-eight million, nine hundred forty-two thousand, four hundred twenty-one".