21948664765 has 8 divisors (see below), whose sum is σ = 26352426240. Its totient is φ = 17549579472.

The previous prime is 21948664763. The next prime is 21948664807. The reversal of 21948664765 is 56746684912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21948664765 - 2¹ = 21948664763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948664763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158709 + ... + 1177498.

It is an arithmetic number, because the mean of its divisors is an integer number (3294053280).

Almost surely, 2^21948664765 is an apocalyptic number.

It is an amenable number.

21948664765 is a deficient number, since it is larger than the sum of its proper divisors (4403761475).

21948664765 is a wasteful number, since it uses less digits than its factorization.

21948664765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338091.

The product of its digits is 17418240, while the sum is 58.

The spelling of 21948664765 in words is "twenty-one billion, nine hundred forty-eight million, six hundred sixty-four thousand, seven hundred sixty-five".