21992274468 has 144 divisors (see below), whose sum is σ = 62528880960. Its totient is φ = 6661154304.

The previous prime is 21992274443. The next prime is 21992274503. The reversal of 21992274468 is 86447229912.

It is a happy number.

21992274468 is a `hidden beast` number, since 2 + 1 + 99 + 22 + 74 + 468 = 666.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1536955 + ... + 1551197.

It is an arithmetic number, because the mean of its divisors is an integer number (434228340).

Almost surely, 2^21992274468 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21992274468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31264440480).

21992274468 is an abundant number, since it is smaller than the sum of its proper divisors (40536606492).

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

21992274468 is a wasteful number, since it uses less digits than its factorization.

21992274468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14331 (or 14294 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 21992274468 in words is "twenty-one billion, nine hundred ninety-two million, two hundred seventy-four thousand, four hundred sixty-eight".