21077233601 has 2 divisors, whose sum is σ = 21077233602. Its totient is φ = 21077233600.

The previous prime is 21077233579. The next prime is 21077233627. The reversal of 21077233601 is 10633277012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20277475201 + 799758400 = 142399^2 + 28280^2 .

It is a cyclic number.

It is not a de Polignac number, because 21077233601 - 2³⁰ = 20003491777 is a prime.

It is a super-2 number, since 2×21077233601² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21077238601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538616800 + 10538616801.

It is an arithmetic number, because the mean of its divisors is an integer number (10538616801).

Almost surely, 2^21077233601 is an apocalyptic number.

It is an amenable number.

21077233601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077233601 is an equidigital number, since it uses as much as digits as its factorization.

21077233601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 32.

The spelling of 21077233601 in words is "twenty-one billion, seventy-seven million, two hundred thirty-three thousand, six hundred one".