21423945352 has 64 divisors (see below), whose sum is σ = 41493513600. Its totient is φ = 10365388800.

The previous prime is 21423945271. The next prime is 21423945397. The reversal of 21423945352 is 25354932412.

It is a super-3 number, since 3×21423945352³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14764227 + ... + 14765677.

It is an arithmetic number, because the mean of its divisors is an integer number (648336150).

Almost surely, 2^21423945352 is an apocalyptic number.

It is an amenable number.

21423945352 is a deficient number, since it is larger than the sum of its proper divisors (20069568248).

21423945352 is a wasteful number, since it uses less digits than its factorization.

21423945352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966 (or 1962 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The spelling of 21423945352 in words is "twenty-one billion, four hundred twenty-three million, nine hundred forty-five thousand, three hundred fifty-two".