79340021 has 2 divisors, whose sum is σ = 79340022. Its totient is φ = 79340020.

The previous prime is 79340017. The next prime is 79340033. The reversal of 79340021 is 12004397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 2146225 = 8786^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 79340021 - 2² = 79340017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79340011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39670010 + 39670011.

It is an arithmetic number, because the mean of its divisors is an integer number (39670011).

Almost surely, 2^79340021 is an apocalyptic number.

It is an amenable number.

79340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

79340021 is an equidigital number, since it uses as much as digits as its factorization.

79340021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 79340021 is about 8907.3015554656. The cubic root of 79340021 is about 429.6987632380.

The spelling of 79340021 in words is "seventy-nine million, three hundred forty thousand, twenty-one".