21977464297 has 2 divisors, whose sum is σ = 21977464298. Its totient is φ = 21977464296.

The previous prime is 21977464283. The next prime is 21977464337. The reversal of 21977464297 is 79246477912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14453810176 + 7523654121 = 120224^2 + 86739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21977464297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21977464207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10988732148 + 10988732149.

It is an arithmetic number, because the mean of its divisors is an integer number (10988732149).

Almost surely, 2^21977464297 is an apocalyptic number.

It is an amenable number.

21977464297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21977464297 is an equidigital number, since it uses as much as digits as its factorization.

21977464297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10668672, while the sum is 58.

The spelling of 21977464297 in words is "twenty-one billion, nine hundred seventy-seven million, four hundred sixty-four thousand, two hundred ninety-seven".