21310323409 has 4 divisors (see below), whose sum is σ = 21437930304. Its totient is φ = 21182716516.

The previous prime is 21310323403. The next prime is 21310323413. The reversal of 21310323409 is 90432301312.

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 a de Polignac number, because none of the positive numbers 2^k-21310323409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310323403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63803197 + ... + 63803530.

It is an arithmetic number, because the mean of its divisors is an integer number (5359482576).

Almost surely, 2^21310323409 is an apocalyptic number.

It is an amenable number.

21310323409 is a deficient number, since it is larger than the sum of its proper divisors (127606895).

21310323409 is a wasteful number, since it uses less digits than its factorization.

21310323409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127606894.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21310323409 in words is "twenty-one billion, three hundred ten million, three hundred twenty-three thousand, four hundred nine".