21504022042 has 8 divisors (see below), whose sum is σ = 32469649632. Its totient is φ = 10680805500.

The previous prime is 21504022037. The next prime is 21504022079. The reversal of 21504022042 is 24022040512.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35602384 + ... + 35602987.

It is an arithmetic number, because the mean of its divisors is an integer number (4058706204).

Almost surely, 2^21504022042 is an apocalyptic number.

21504022042 is a deficient number, since it is larger than the sum of its proper divisors (10965627590).

21504022042 is a wasteful number, since it uses less digits than its factorization.

21504022042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71205524.

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 21504022042 its reverse (24022040512), we get a palindrome (45526062554).

The spelling of 21504022042 in words is "twenty-one billion, five hundred four million, twenty-two thousand, forty-two".