21977740313976 has 16 divisors (see below), whose sum is σ = 54944350785000. Its totient is φ = 7325913437984.

The previous prime is 21977740313951. The next prime is 21977740313989. The reversal of 21977740313976 is 67931304777912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457869589851 + ... + 457869589898.

Almost surely, 2^{21977740313976} is an apocalyptic number.

It is an amenable number.

21977740313976 is an abundant number, since it is smaller than the sum of its proper divisors (32966610471024).

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

21977740313976 is a wasteful number, since it uses less digits than its factorization.

21977740313976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915739179758 (or 915739179754 counting only the distinct ones).

The product of its (nonzero) digits is 84015792, while the sum is 66.

The spelling of 21977740313976 in words is "twenty-one trillion, nine hundred seventy-seven billion, seven hundred forty million, three hundred thirteen thousand, nine hundred seventy-six".