21401596959571 has 2 divisors, whose sum is σ = 21401596959572. Its totient is φ = 21401596959570.

The previous prime is 21401596959551. The next prime is 21401596959583. The reversal of 21401596959571 is 17595969510412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21401596959571 - 2¹³ = 21401596951379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21401596959551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700798479785 + 10700798479786.

It is an arithmetic number, because the mean of its divisors is an integer number (10700798479786).

Almost surely, 2^{21401596959571} is an apocalyptic number.

21401596959571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401596959571 is an equidigital number, since it uses as much as digits as its factorization.

21401596959571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618000, while the sum is 64.

The spelling of 21401596959571 in words is "twenty-one trillion, four hundred one billion, five hundred ninety-six million, nine hundred fifty-nine thousand, five hundred seventy-one".