421551155 has 4 divisors (see below), whose sum is σ = 505861392. Its totient is φ = 337240920.

The previous prime is 421551149. The next prime is 421551173. The reversal of 421551155 is 551155124.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 421551155 - 2⁴ = 421551139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42155111 + ... + 42155120.

It is an arithmetic number, because the mean of its divisors is an integer number (126465348).

Almost surely, 2^421551155 is an apocalyptic number.

421551155 is a deficient number, since it is larger than the sum of its proper divisors (84310237).

421551155 is an equidigital number, since it uses as much as digits as its factorization.

421551155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84310236.

The product of its digits is 5000, while the sum is 29.

The square root of 421551155 is about 20531.7109613398. The cubic root of 421551155 is about 749.8080427259.

The spelling of 421551155 in words is "four hundred twenty-one million, five hundred fifty-one thousand, one hundred fifty-five".