421431029 has 2 divisors, whose sum is σ = 421431030. Its totient is φ = 421431028.

The previous prime is 421431011. The next prime is 421431083. The reversal of 421431029 is 920134124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357399025 + 64032004 = 18905^2 + 8002^2 .

It is a cyclic number.

It is not a de Polignac number, because 421431029 - 2²⁰ = 420382453 is a prime.

It is a super-2 number, since 2×421431029² = 355208224407997682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421430989 and 421431007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421431929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210715514 + 210715515.

It is an arithmetic number, because the mean of its divisors is an integer number (210715515).

Almost surely, 2^421431029 is an apocalyptic number.

It is an amenable number.

421431029 is a deficient number, since it is larger than the sum of its proper divisors (1).

421431029 is an equidigital number, since it uses as much as digits as its factorization.

421431029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 421431029 is about 20528.7853756621. The cubic root of 421431029 is about 749.7368137289.

The spelling of 421431029 in words is "four hundred twenty-one million, four hundred thirty-one thousand, twenty-nine".