21173770323 has 24 divisors (see below), whose sum is σ = 30725765616. Its totient is φ = 14050713600.

The previous prime is 21173770313. The next prime is 21173770349. The reversal of 21173770323 is 32307737112.

It is not a de Polignac number, because 21173770323 - 2¹⁰ = 21173769299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21173770313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1938708 + ... + 1949598.

It is an arithmetic number, because the mean of its divisors is an integer number (1280240234).

Almost surely, 2^21173770323 is an apocalyptic number.

21173770323 is a deficient number, since it is larger than the sum of its proper divisors (9551995293).

21173770323 is a wasteful number, since it uses less digits than its factorization.

21173770323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11875 (or 11872 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 36.

The spelling of 21173770323 in words is "twenty-one billion, one hundred seventy-three million, seven hundred seventy thousand, three hundred twenty-three".