21032310309 has 4 divisors (see below), whose sum is σ = 28043080416. Its totient is φ = 14021540204.

The previous prime is 21032310301. The next prime is 21032310311. The reversal of 21032310309 is 90301323012.

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 21032310309 - 2³ = 21032310301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032310301) 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, 3505385049 + ... + 3505385054.

It is an arithmetic number, because the mean of its divisors is an integer number (7010770104).

Almost surely, 2^21032310309 is an apocalyptic number.

It is an amenable number.

21032310309 is a deficient number, since it is larger than the sum of its proper divisors (7010770107).

21032310309 is an equidigital number, since it uses as much as digits as its factorization.

21032310309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010770106.

The product of its (nonzero) digits is 972, while the sum is 24.

The spelling of 21032310309 in words is "twenty-one billion, thirty-two million, three hundred ten thousand, three hundred nine".