21522472434 has 24 divisors (see below), whose sum is σ = 46673591952. Its totient is φ = 7167762360.

The previous prime is 21522472421. The next prime is 21522472493. The reversal of 21522472434 is 43427422512.

21522472434 is a `hidden beast` number, since 2 + 152 + 2 + 4 + 72 + 434 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 512152 + ... + 552579.

It is an arithmetic number, because the mean of its divisors is an integer number (1944732998).

Almost surely, 2^21522472434 is an apocalyptic number.

21522472434 is an abundant number, since it is smaller than the sum of its proper divisors (25151119518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21522472434 is a wasteful number, since it uses less digits than its factorization.

21522472434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065862 (or 1065859 counting only the distinct ones).

The product of its digits is 107520, while the sum is 36.

Adding to 21522472434 its reverse (43427422512), we get a palindrome (64949894946).

The spelling of 21522472434 in words is "twenty-one billion, five hundred twenty-two million, four hundred seventy-two thousand, four hundred thirty-four".