421421047 has 2 divisors, whose sum is σ = 421421048. Its totient is φ = 421421046.

The previous prime is 421421029. The next prime is 421421053. The reversal of 421421047 is 740124124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421421047 - 2²³ = 413032439 is a prime.

It is equal to p_22416064 and since 421421047 and 22416064 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421421017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210710523 + 210710524.

It is an arithmetic number, because the mean of its divisors is an integer number (210710524).

Almost surely, 2^421421047 is an apocalyptic number.

421421047 is a deficient number, since it is larger than the sum of its proper divisors (1).

421421047 is an equidigital number, since it uses as much as digits as its factorization.

421421047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 421421047 is about 20528.5422521912. The cubic root of 421421047 is about 749.7308942692.

The spelling of 421421047 in words is "four hundred twenty-one million, four hundred twenty-one thousand, forty-seven".