21321974701 has 2 divisors, whose sum is σ = 21321974702. Its totient is φ = 21321974700.

The previous prime is 21321974647. The next prime is 21321974731. The reversal of 21321974701 is 10747912312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19202753476 + 2119221225 = 138574^2 + 46035^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321974701 - 2¹⁷ = 21321843629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321974731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660987350 + 10660987351.

It is an arithmetic number, because the mean of its divisors is an integer number (10660987351).

Almost surely, 2^21321974701 is an apocalyptic number.

It is an amenable number.

21321974701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321974701 is an equidigital number, since it uses as much as digits as its factorization.

21321974701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 21321974701 in words is "twenty-one billion, three hundred twenty-one million, nine hundred seventy-four thousand, seven hundred one".