431401021 has 2 divisors, whose sum is σ = 431401022. Its totient is φ = 431401020.

The previous prime is 431400953. The next prime is 431401031. The reversal of 431401021 is 120104134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298805796 + 132595225 = 17286^2 + 11515^2 .

It is a cyclic number.

It is not a de Polignac number, because 431401021 - 2²³ = 423012413 is a prime.

It is a super-2 number, since 2×431401021² = 372213681839684882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 431400986 and 431401004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431401031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215700510 + 215700511.

It is an arithmetic number, because the mean of its divisors is an integer number (215700511).

Almost surely, 2^431401021 is an apocalyptic number.

It is an amenable number.

431401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

431401021 is an equidigital number, since it uses as much as digits as its factorization.

431401021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 431401021 is about 20770.1954973948. The cubic root of 431401021 is about 755.6030858131.

Adding to 431401021 its reverse (120104134), we get a palindrome (551505155).

The spelling of 431401021 in words is "four hundred thirty-one million, four hundred one thousand, twenty-one".