2045475211721 has 2 divisors, whose sum is σ = 2045475211722. Its totient is φ = 2045475211720.

The previous prime is 2045475211609. The next prime is 2045475211723. The reversal of 2045475211721 is 1271125745402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1866677317696 + 178797894025 = 1366264^2 + 422845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2045475211721 is a prime.

Together with 2045475211723, 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 (2045475211723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1022737605860 + 1022737605861.

It is an arithmetic number, because the mean of its divisors is an integer number (1022737605861).

Almost surely, 2^{2045475211721} is an apocalyptic number.

It is an amenable number.

2045475211721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2045475211721 is an equidigital number, since it uses as much as digits as its factorization.

2045475211721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156800, while the sum is 41.

The spelling of 2045475211721 in words is "two trillion, forty-five billion, four hundred seventy-five million, two hundred eleven thousand, seven hundred twenty-one".