421312069 has 2 divisors, whose sum is σ = 421312070. Its totient is φ = 421312068.

The previous prime is 421312063. The next prime is 421312093. The reversal of 421312069 is 960213124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384552100 + 36759969 = 19610^2 + 6063^2 .

It is a cyclic number.

It is not a de Polignac number, because 421312069 - 2¹⁵ = 421279301 is a prime.

It is a super-2 number, since 2×421312069² = 355007718970121522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421312063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210656034 + 210656035.

It is an arithmetic number, because the mean of its divisors is an integer number (210656035).

Almost surely, 2^421312069 is an apocalyptic number.

It is an amenable number.

421312069 is a deficient number, since it is larger than the sum of its proper divisors (1).

421312069 is an equidigital number, since it uses as much as digits as its factorization.

421312069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 421312069 is about 20525.8877761718. The cubic root of 421312069 is about 749.6662627739. Note that the first 3 decimals are identical.

The spelling of 421312069 in words is "four hundred twenty-one million, three hundred twelve thousand, sixty-nine".