21926347380 has 384 divisors, whose sum is σ = 83561103360. Its totient is φ = 4658964480.

The previous prime is 21926347367. The next prime is 21926347411. The reversal of 21926347380 is 8374362912.

21926347380 is a `hidden beast` number, since 2 + 1 + 9 + 2 + 634 + 7 + 3 + 8 + 0 = 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 127 ways as a sum of consecutive naturals, for example, 5331525 + ... + 5335635.

It is an arithmetic number, because the mean of its divisors is an integer number (217607040).

Almost surely, 2^21926347380 is an apocalyptic number.

21926347380 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 21926347380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41780551680).

21926347380 is an abundant number, since it is smaller than the sum of its proper divisors (61634755980).

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

21926347380 is a wasteful number, since it uses less digits than its factorization.

21926347380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236 (or 4228 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 21926347380 in words is "twenty-one billion, nine hundred twenty-six million, three hundred forty-seven thousand, three hundred eighty".