402431011421 has 2 divisors, whose sum is σ = 402431011422. Its totient is φ = 402431011420.

The previous prime is 402431011391. The next prime is 402431011447. The reversal of 402431011421 is 124110134204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390568752025 + 11862259396 = 624955^2 + 108914^2 .

It is a cyclic number.

It is not a de Polignac number, because 402431011421 - 2¹⁴ = 402430995037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402431011471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201215505710 + 201215505711.

It is an arithmetic number, because the mean of its divisors is an integer number (201215505711).

Almost surely, 2^402431011421 is an apocalyptic number.

It is an amenable number.

402431011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

402431011421 is an equidigital number, since it uses as much as digits as its factorization.

402431011421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 402431011421 its reverse (124110134204), we get a palindrome (526541145625).

The spelling of 402431011421 in words is "four hundred two billion, four hundred thirty-one million, eleven thousand, four hundred twenty-one".