21021631701461 has 2 divisors, whose sum is σ = 21021631701462. Its totient is φ = 21021631701460.

The previous prime is 21021631701457. The next prime is 21021631701503. The reversal of 21021631701461 is 16410713612012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21011167434436 + 10464267025 = 4583794^2 + 102295^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021631701461 - 2² = 21021631701457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021631701401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510815850730 + 10510815850731.

It is an arithmetic number, because the mean of its divisors is an integer number (10510815850731).

Almost surely, 2^{21021631701461} is an apocalyptic number.

It is an amenable number.

21021631701461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021631701461 is an equidigital number, since it uses as much as digits as its factorization.

21021631701461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 21021631701461 in words is "twenty-one trillion, twenty-one billion, six hundred thirty-one million, seven hundred one thousand, four hundred sixty-one".