431300021 has 2 divisors, whose sum is σ = 431300022. Its totient is φ = 431300020.

The previous prime is 431300017. The next prime is 431300027. The reversal of 431300021 is 120003134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431019121 + 280900 = 20761^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 431300021 - 2² = 431300017 is a prime.

It is a super-2 number, since 2×431300021² = 372039416229200882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 431299969 and 431300005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431300027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215650010 + 215650011.

It is an arithmetic number, because the mean of its divisors is an integer number (215650011).

Almost surely, 2^431300021 is an apocalyptic number.

It is an amenable number.

431300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

431300021 is an equidigital number, since it uses as much as digits as its factorization.

431300021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 431300021 is about 20767.7639865249. The cubic root of 431300021 is about 755.5441137164.

Adding to 431300021 its reverse (120003134), we get a palindrome (551303155).

The spelling of 431300021 in words is "four hundred thirty-one million, three hundred thousand, twenty-one".