21977426211840 has 1056 divisors, whose sum is σ = 89483754627072. Its totient is φ = 4931739648000.

The previous prime is 21977426211833. The next prime is 21977426211869. The reversal of 21977426211840 is 4811262477912.

It is a happy number.

21977426211840 is a `hidden beast` number, since 2 + 1 + 9 + 7 + 7 + 4 + 2 + 621 + 1 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1056).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 361375035 + ... + 361435845.

Almost surely, 2^{21977426211840} is an apocalyptic number.

21977426211840 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 21977426211840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44741877313536).

21977426211840 is an abundant number, since it is smaller than the sum of its proper divisors (67506328415232).

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

21977426211840 is a wasteful number, since it uses less digits than its factorization.

21977426211840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60907 (or 60886 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 21977426211840 in words is "twenty-one trillion, nine hundred seventy-seven billion, four hundred twenty-six million, two hundred eleven thousand, eight hundred forty".