423236211589721 has 2 divisors, whose sum is σ = 423236211589722. Its totient is φ = 423236211589720.

The previous prime is 423236211589699. The next prime is 423236211589883. The reversal of 423236211589721 is 127985112632324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335466295116121 + 87769916473600 = 18315739^2 + 9368560^2 .

It is a cyclic number.

It is not a de Polignac number, because 423236211589721 - 2⁴² = 418838165078617 is a prime.

It is not a weakly prime, because it can be changed into another prime (423236211589921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211618105794860 + 211618105794861.

It is an arithmetic number, because the mean of its divisors is an integer number (211618105794861).

Almost surely, 2^{423236211589721} is an apocalyptic number.

It is an amenable number.

423236211589721 is a deficient number, since it is larger than the sum of its proper divisors (1).

423236211589721 is an equidigital number, since it uses as much as digits as its factorization.

423236211589721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 56.

The spelling of 423236211589721 in words is "four hundred twenty-three trillion, two hundred thirty-six billion, two hundred eleven million, five hundred eighty-nine thousand, seven hundred twenty-one".