21037995771696 has 120 divisors (see below), whose sum is σ = 59010995197440. Its totient is φ = 6996729091968.

The previous prime is 21037995771679. The next prime is 21037995771713. The reversal of 21037995771696 is 69617759973012.

21037995771696 is a `hidden beast` number, since 2 + 1 + 0 + 37 + 9 + 9 + 577 + 16 + 9 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (21037995771679) and next prime (21037995771713).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1099211695 + ... + 1099230833.

It is an arithmetic number, because the mean of its divisors is an integer number (491758293312).

Almost surely, 2^{21037995771696} is an apocalyptic number.

It is an amenable number.

21037995771696 is an abundant number, since it is smaller than the sum of its proper divisors (37972999425744).

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

21037995771696 is a wasteful number, since it uses less digits than its factorization.

21037995771696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36103 (or 36094 counting only the distinct ones).

The product of its (nonzero) digits is 270050760, while the sum is 72.

The spelling of 21037995771696 in words is "twenty-one trillion, thirty-seven billion, nine hundred ninety-five million, seven hundred seventy-one thousand, six hundred ninety-six".