21542829558 has 16 divisors (see below), whose sum is σ = 43098664896. Its totient is φ = 7178775560.

The previous prime is 21542829551. The next prime is 21542829559. The reversal of 21542829558 is 85592824512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21542829558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542829551) 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, 520308 + ... + 560183.

It is an arithmetic number, because the mean of its divisors is an integer number (2693666556).

Almost surely, 2^21542829558 is an apocalyptic number.

21542829558 is an abundant number, since it is smaller than the sum of its proper divisors (21555835338).

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

21542829558 is a wasteful number, since it uses less digits than its factorization.

21542829558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083819.

The product of its digits is 2304000, while the sum is 51.

The spelling of 21542829558 in words is "twenty-one billion, five hundred forty-two million, eight hundred twenty-nine thousand, five hundred fifty-eight".