21326503109 has 8 divisors (see below), whose sum is σ = 21378581760. Its totient is φ = 21274456896.

The previous prime is 21326503073. The next prime is 21326503151. The reversal of 21326503109 is 90130562312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21326503109 - 2¹² = 21326499013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326503609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1764842 + ... + 1776884.

It is an arithmetic number, because the mean of its divisors is an integer number (2672322720).

Almost surely, 2^21326503109 is an apocalyptic number.

It is an amenable number.

21326503109 is a deficient number, since it is larger than the sum of its proper divisors (52078651).

21326503109 is a wasteful number, since it uses less digits than its factorization.

21326503109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16219.

The product of its (nonzero) digits is 9720, while the sum is 32.

The spelling of 21326503109 in words is "twenty-one billion, three hundred twenty-six million, five hundred three thousand, one hundred nine".