21642543352 has 16 divisors (see below), whose sum is σ = 40581412200. Its totient is φ = 10820833440.

The previous prime is 21642543347. The next prime is 21642543361. The reversal of 21642543352 is 25334524612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264727 + ... + 336697.

Almost surely, 2^21642543352 is an apocalyptic number.

It is an amenable number.

21642543352 is a deficient number, since it is larger than the sum of its proper divisors (18938868848).

21642543352 is a wasteful number, since it uses less digits than its factorization.

21642543352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109566 (or 109562 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

The spelling of 21642543352 in words is "twenty-one billion, six hundred forty-two million, five hundred forty-three thousand, three hundred fifty-two".