21822775380 has 336 divisors, whose sum is σ = 80662350720. Its totient is φ = 4852410624.

The previous prime is 21822775363. The next prime is 21822775393. The reversal of 21822775380 is 8357722812.

21822775380 is a `hidden beast` number, since 2 + 182 + 27 + 75 + 380 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 3773331 + ... + 3779109.

It is an arithmetic number, because the mean of its divisors is an integer number (240066520).

Almost surely, 2^21822775380 is an apocalyptic number.

21822775380 is a gapful number since it is divisible by the number (20) 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 21822775380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40331175360).

21822775380 is an abundant number, since it is smaller than the sum of its proper divisors (58839575340).

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

21822775380 is a wasteful number, since it uses less digits than its factorization.

21822775380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5850 (or 5833 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 21822775380 in words is "twenty-one billion, eight hundred twenty-two million, seven hundred seventy-five thousand, three hundred eighty".