21607733461 has 2 divisors, whose sum is σ = 21607733462. Its totient is φ = 21607733460.

The previous prime is 21607733437. The next prime is 21607733471. The reversal of 21607733461 is 16433770612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14388002500 + 7219730961 = 119950^2 + 84969^2 .

It is a cyclic number.

It is not a de Polignac number, because 21607733461 - 2¹¹ = 21607731413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21607733471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10803866730 + 10803866731.

It is an arithmetic number, because the mean of its divisors is an integer number (10803866731).

Almost surely, 2^21607733461 is an apocalyptic number.

It is an amenable number.

21607733461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21607733461 is an equidigital number, since it uses as much as digits as its factorization.

21607733461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 21607733461 in words is "twenty-one billion, six hundred seven million, seven hundred thirty-three thousand, four hundred sixty-one".