21536090929 has 2 divisors, whose sum is σ = 21536090930. Its totient is φ = 21536090928.

The previous prime is 21536090921. The next prime is 21536090957. The reversal of 21536090929 is 92909063512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20135610000 + 1400480929 = 141900^2 + 37423^2 .

It is a cyclic number.

It is not a de Polignac number, because 21536090929 - 2³ = 21536090921 is a prime.

It is not a weakly prime, because it can be changed into another prime (21536090921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768045464 + 10768045465.

It is an arithmetic number, because the mean of its divisors is an integer number (10768045465).

Almost surely, 2^21536090929 is an apocalyptic number.

It is an amenable number.

21536090929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536090929 is an equidigital number, since it uses as much as digits as its factorization.

21536090929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 46.

The spelling of 21536090929 in words is "twenty-one billion, five hundred thirty-six million, ninety thousand, nine hundred twenty-nine".