421690433 has 2 divisors, whose sum is σ = 421690434. Its totient is φ = 421690432.

The previous prime is 421690411. The next prime is 421690469. The reversal of 421690433 is 334096124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358837249 + 62853184 = 18943^2 + 7928^2 .

It is a cyclic number.

It is not a de Polignac number, because 421690433 - 2²⁴ = 404913217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421690433.

It is not a weakly prime, because it can be changed into another prime (421690403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210845216 + 210845217.

It is an arithmetic number, because the mean of its divisors is an integer number (210845217).

Almost surely, 2^421690433 is an apocalyptic number.

It is an amenable number.

421690433 is a deficient number, since it is larger than the sum of its proper divisors (1).

421690433 is an equidigital number, since it uses as much as digits as its factorization.

421690433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 421690433 is about 20535.1024589604. The cubic root of 421690433 is about 749.8906110091.

It can be divided in two parts, 4216 and 90433, that added together give a palindrome (94649).

The spelling of 421690433 in words is "four hundred twenty-one million, six hundred ninety thousand, four hundred thirty-three".