421554013 has 2 divisors, whose sum is σ = 421554014. Its totient is φ = 421554012.

The previous prime is 421554011. The next prime is 421554019. The reversal of 421554013 is 310455124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278823204 + 142730809 = 16698^2 + 11947^2 .

It is a cyclic number.

It is not a de Polignac number, because 421554013 - 2¹ = 421554011 is a prime.

Together with 421554011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421554011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210777006 + 210777007.

It is an arithmetic number, because the mean of its divisors is an integer number (210777007).

Almost surely, 2^421554013 is an apocalyptic number.

It is an amenable number.

421554013 is a deficient number, since it is larger than the sum of its proper divisors (1).

421554013 is an equidigital number, since it uses as much as digits as its factorization.

421554013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 421554013 is about 20531.7805608768. The cubic root of 421554013 is about 749.8097372190.

The spelling of 421554013 in words is "four hundred twenty-one million, five hundred fifty-four thousand, thirteen".