67929021 has 12 divisors (see below), whose sum is σ = 98192640. Its totient is φ = 45252360.

The previous prime is 67929013. The next prime is 67929023. The reversal of 67929021 is 12092976.

It is not a de Polignac number, because 67929021 - 2³ = 67929013 is a prime.

It is a super-2 number, since 2×67929021² = 9228703788036882, which contains 22 as substring.

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 (67929023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18466 + ... + 21836.

It is an arithmetic number, because the mean of its divisors is an integer number (8182720).

Almost surely, 2^67929021 is an apocalyptic number.

It is an amenable number.

67929021 is a deficient number, since it is larger than the sum of its proper divisors (30263619).

67929021 is a wasteful number, since it uses less digits than its factorization.

67929021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5616 (or 5613 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 67929021 is about 8241.9063935476. The cubic root of 67929021 is about 408.0234451637.

The spelling of 67929021 in words is "sixty-seven million, nine hundred twenty-nine thousand, twenty-one".