68422921 has 8 divisors (see below), whose sum is σ = 80720384. Its totient is φ = 56756160.

The previous prime is 68422903. The next prime is 68422931. The reversal of 68422921 is 12922486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68422921 - 2¹³ = 68414729 is a prime.

It is a super-2 number, since 2×68422921² = 9363392236344482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68422931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157440 + ... + 157873.

It is an arithmetic number, because the mean of its divisors is an integer number (10090048).

Almost surely, 2^68422921 is an apocalyptic number.

It is an amenable number.

68422921 is a deficient number, since it is larger than the sum of its proper divisors (12297463).

68422921 is a wasteful number, since it uses less digits than its factorization.

68422921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315351.

The product of its digits is 13824, while the sum is 34.

The square root of 68422921 is about 8271.8148552781. The cubic root of 68422921 is about 409.0099470922.

The spelling of 68422921 in words is "sixty-eight million, four hundred twenty-two thousand, nine hundred twenty-one".