21952189588 has 48 divisors (see below), whose sum is σ = 45395682304. Its totient is φ = 9089521920.

The previous prime is 21952189547. The next prime is 21952189627. The reversal of 21952189588 is 88598125912.

It is a super-3 number, since 3×21952189588³ (a number of 32 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 511456 + ... + 552712.

Almost surely, 2^21952189588 is an apocalyptic number.

21952189588 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21952189588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22697841152).

21952189588 is an abundant number, since it is smaller than the sum of its proper divisors (23443492716).

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

21952189588 is a wasteful number, since it uses less digits than its factorization.

21952189588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41912 (or 41910 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 58.

The spelling of 21952189588 in words is "twenty-one billion, nine hundred fifty-two million, one hundred eighty-nine thousand, five hundred eighty-eight".