21523555422 has 12 divisors (see below), whose sum is σ = 46634370120. Its totient is φ = 7174518468.

The previous prime is 21523555387. The next prime is 21523555439. The reversal of 21523555422 is 22455532512.

21523555422 is a `hidden beast` number, since 2 + 1 + 52 + 35 + 554 + 22 = 666.

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 5 ways as a sum of consecutive naturals, for example, 597876522 + ... + 597876557.

It is an arithmetic number, because the mean of its divisors is an integer number (3886197510).

Almost surely, 2^21523555422 is an apocalyptic number.

21523555422 is an abundant number, since it is smaller than the sum of its proper divisors (25110814698).

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

21523555422 is a wasteful number, since it uses less digits than its factorization.

21523555422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195753087 (or 1195753084 counting only the distinct ones).

The product of its digits is 120000, while the sum is 36.

The spelling of 21523555422 in words is "twenty-one billion, five hundred twenty-three million, five hundred fifty-five thousand, four hundred twenty-two".