21642294052 has 24 divisors (see below), whose sum is σ = 40794538400. Its totient is φ = 10013201856.

The previous prime is 21642294049. The next prime is 21642294083. The reversal of 21642294052 is 25049224612.

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 7 ways as a sum of consecutive naturals, for example, 3307977 + ... + 3314512.

Almost surely, 2^21642294052 is an apocalyptic number.

It is an amenable number.

21642294052 is a deficient number, since it is larger than the sum of its proper divisors (19152244348).

21642294052 is a wasteful number, since it uses less digits than its factorization.

21642294052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622555 (or 6622553 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 21642294052 in words is "twenty-one billion, six hundred forty-two million, two hundred ninety-four thousand, fifty-two".