21882726558 has 160 divisors (see below), whose sum is σ = 62625201408. Its totient is φ = 5545065600.

The previous prime is 21882726487. The next prime is 21882726563. The reversal of 21882726558 is 85562728812.

21882726558 is a `hidden beast` number, since 2 + 1 + 8 + 82 + 7 + 2 + 6 + 558 = 666.

It is a super-2 number, since 2×21882726558² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 490041 + ... + 532827.

Almost surely, 2^21882726558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21882726558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31312600704).

21882726558 is an abundant number, since it is smaller than the sum of its proper divisors (40742474850).

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

21882726558 is a wasteful number, since it uses less digits than its factorization.

21882726558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42860 (or 42851 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The spelling of 21882726558 in words is "twenty-one billion, eight hundred eighty-two million, seven hundred twenty-six thousand, five hundred fifty-eight".