20977133297 has 2 divisors, whose sum is σ = 20977133298. Its totient is φ = 20977133296.

The previous prime is 20977133263. The next prime is 20977133299. The reversal of 20977133297 is 79233177902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17871411856 + 3105721441 = 133684^2 + 55729^2 .

It is a cyclic number.

It is not a de Polignac number, because 20977133297 - 2¹⁴ = 20977116913 is a prime.

Together with 20977133299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20977133299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488566648 + 10488566649.

It is an arithmetic number, because the mean of its divisors is an integer number (10488566649).

Almost surely, 2^20977133297 is an apocalyptic number.

It is an amenable number.

20977133297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20977133297 is an equidigital number, since it uses as much as digits as its factorization.

20977133297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000188, while the sum is 50.

The spelling of 20977133297 in words is "twenty billion, nine hundred seventy-seven million, one hundred thirty-three thousand, two hundred ninety-seven".