21023264129 has 4 divisors (see below), whose sum is σ = 24026587584. Its totient is φ = 18019940676.

The previous prime is 21023264113. The next prime is 21023264161. The reversal of 21023264129 is 92146232012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21023264129 - 2⁴ = 21023264113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023264095 and 21023264104.

It is not an unprimeable number, because it can be changed into a prime (21023264329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501661717 + ... + 1501661730.

It is an arithmetic number, because the mean of its divisors is an integer number (6006646896).

Almost surely, 2^21023264129 is an apocalyptic number.

It is an amenable number.

21023264129 is a deficient number, since it is larger than the sum of its proper divisors (3003323455).

21023264129 is an equidigital number, since it uses as much as digits as its factorization.

21023264129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003323454.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21023264129 in words is "twenty-one billion, twenty-three million, two hundred sixty-four thousand, one hundred twenty-nine".