21525000769 has 2 divisors, whose sum is σ = 21525000770. Its totient is φ = 21525000768.

The previous prime is 21525000713. The next prime is 21525000781. The reversal of 21525000769 is 96700052512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20774898225 + 750102544 = 144135^2 + 27388^2 .

It is a cyclic number.

It is not a de Polignac number, because 21525000769 - 2¹⁵ = 21524968001 is a prime.

It is a super-2 number, since 2×21525000769² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21525070769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762500384 + 10762500385.

It is an arithmetic number, because the mean of its divisors is an integer number (10762500385).

Almost surely, 2^21525000769 is an apocalyptic number.

It is an amenable number.

21525000769 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525000769 is an equidigital number, since it uses as much as digits as its factorization.

21525000769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 21525000769 in words is "twenty-one billion, five hundred twenty-five million, seven hundred sixty-nine", and thus it is an aban number.