21152766667676 has 36 divisors (see below), whose sum is σ = 43362542593104. Its totient is φ = 8844362350080.

The previous prime is 21152766667673. The next prime is 21152766667729. The reversal of 21152766667676 is 67676666725112.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152766667673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224657261 + ... + 224751396.

Almost surely, 2^{21152766667676} is an apocalyptic number.

It is an amenable number.

21152766667676 is an abundant number, since it is smaller than the sum of its proper divisors (22209775925428).

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

21152766667676 is a wasteful number, since it uses less digits than its factorization.

21152766667676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449408750 (or 449408707 counting only the distinct ones).

The product of its digits is 320060160, while the sum is 68.

The spelling of 21152766667676 in words is "twenty-one trillion, one hundred fifty-two billion, seven hundred sixty-six million, six hundred sixty-seven thousand, six hundred seventy-six".