21522557854 has 16 divisors (see below), whose sum is σ = 36900108000. Its totient is φ = 9222879744.

The previous prime is 21522557851. The next prime is 21522557863. The reversal of 21522557854 is 45875522512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522557851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41742 + ... + 211630.

It is an arithmetic number, because the mean of its divisors is an integer number (2306256750).

Almost surely, 2^21522557854 is an apocalyptic number.

21522557854 is a deficient number, since it is larger than the sum of its proper divisors (15377550146).

21522557854 is a wasteful number, since it uses less digits than its factorization.

21522557854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178947.

The product of its digits is 1120000, while the sum is 46.

The spelling of 21522557854 in words is "twenty-one billion, five hundred twenty-two million, five hundred fifty-seven thousand, eight hundred fifty-four".