213643422721 has 2 divisors, whose sum is σ = 213643422722. Its totient is φ = 213643422720.

The previous prime is 213643422697. The next prime is 213643422731. The reversal of 213643422721 is 127224346312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212908416400 + 735006321 = 461420^2 + 27111^2 .

It is a cyclic number.

It is not a de Polignac number, because 213643422721 - 2⁷ = 213643422593 is a prime.

It is not a weakly prime, because it can be changed into another prime (213643422731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106821711360 + 106821711361.

It is an arithmetic number, because the mean of its divisors is an integer number (106821711361).

Almost surely, 2^213643422721 is an apocalyptic number.

It is an amenable number.

213643422721 is a deficient number, since it is larger than the sum of its proper divisors (1).

213643422721 is an equidigital number, since it uses as much as digits as its factorization.

213643422721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 37.

The spelling of 213643422721 in words is "two hundred thirteen billion, six hundred forty-three million, four hundred twenty-two thousand, seven hundred twenty-one".