406111345421 has 2 divisors, whose sum is σ = 406111345422. Its totient is φ = 406111345420.

The previous prime is 406111345369. The next prime is 406111345427. The reversal of 406111345421 is 124543111604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230203242025 + 175908103396 = 479795^2 + 419414^2 .

It is a cyclic number.

It is not a de Polignac number, because 406111345421 - 2²⁶ = 406044236557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406111345427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203055672710 + 203055672711.

It is an arithmetic number, because the mean of its divisors is an integer number (203055672711).

Almost surely, 2^406111345421 is an apocalyptic number.

It is an amenable number.

406111345421 is a deficient number, since it is larger than the sum of its proper divisors (1).

406111345421 is an equidigital number, since it uses as much as digits as its factorization.

406111345421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 406111345421 in words is "four hundred six billion, one hundred eleven million, three hundred forty-five thousand, four hundred twenty-one".