21079791037 has 2 divisors, whose sum is σ = 21079791038. Its totient is φ = 21079791036.

The previous prime is 21079791017. The next prime is 21079791101. The reversal of 21079791037 is 73019797012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21053719801 + 26071236 = 145099^2 + 5106^2 .

It is a cyclic number.

It is not a de Polignac number, because 21079791037 - 2⁷ = 21079790909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21079791017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10539895518 + 10539895519.

It is an arithmetic number, because the mean of its divisors is an integer number (10539895519).

Almost surely, 2^21079791037 is an apocalyptic number.

It is an amenable number.

21079791037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21079791037 is an equidigital number, since it uses as much as digits as its factorization.

21079791037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 166698, while the sum is 46.

The spelling of 21079791037 in words is "twenty-one billion, seventy-nine million, seven hundred ninety-one thousand, thirty-seven".