21995976707 has 2 divisors, whose sum is σ = 21995976708. Its totient is φ = 21995976706.

The previous prime is 21995976703. The next prime is 21995976757. The reversal of 21995976707 is 70767959912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21995976707 - 2² = 21995976703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21995976707.

It is not a weakly prime, because it can be changed into another prime (21995976701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10997988353 + 10997988354.

It is an arithmetic number, because the mean of its divisors is an integer number (10997988354).

Almost surely, 2^21995976707 is an apocalyptic number.

21995976707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21995976707 is an equidigital number, since it uses as much as digits as its factorization.

21995976707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15002820, while the sum is 62.

The spelling of 21995976707 in words is "twenty-one billion, nine hundred ninety-five million, nine hundred seventy-six thousand, seven hundred seven".