21394922740880 has 160 divisors (see below), whose sum is σ = 53660514507264. Its totient is φ = 7886267117568.

The previous prime is 21394922740879. The next prime is 21394922740943. The reversal of 21394922740880 is 8804722949312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1925210204 + ... + 1925221316.

Almost surely, 2^{21394922740880} is an apocalyptic number.

21394922740880 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 21394922740880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26830257253632).

21394922740880 is an abundant number, since it is smaller than the sum of its proper divisors (32265591766384).

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

21394922740880 is a wasteful number, since it uses less digits than its factorization.

21394922740880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14113 (or 14107 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 21394922740880 in words is "twenty-one trillion, three hundred ninety-four billion, nine hundred twenty-two million, seven hundred forty thousand, eight hundred eighty".