21023102309 has 8 divisors (see below), whose sum is σ = 24283369728. Its totient is φ = 17987680960.

The previous prime is 21023102297. The next prime is 21023102329. The reversal of 21023102309 is 90320132012.

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

It is not a de Polignac number, because 21023102309 - 2⁸ = 21023102053 is a prime.

It is a super-2 number, since 2×21023102309² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023102329) 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, 56211317 + ... + 56211690.

It is an arithmetic number, because the mean of its divisors is an integer number (3035421216).

Almost surely, 2^21023102309 is an apocalyptic number.

It is an amenable number.

21023102309 is a deficient number, since it is larger than the sum of its proper divisors (3260267419).

21023102309 is a wasteful number, since it uses less digits than its factorization.

21023102309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112423035.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21023102309 in words is "twenty-one billion, twenty-three million, one hundred two thousand, three hundred nine".