421505155 has 8 divisors (see below), whose sum is σ = 507978432. Its totient is φ = 335755968.

The previous prime is 421505143. The next prime is 421505159. The reversal of 421505155 is 551505124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421505155 - 2¹⁹ = 420980867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421505159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179739 + ... + 182068.

It is an arithmetic number, because the mean of its divisors is an integer number (63497304).

Almost surely, 2^421505155 is an apocalyptic number.

421505155 is a deficient number, since it is larger than the sum of its proper divisors (86473277).

421505155 is a wasteful number, since it uses less digits than its factorization.

421505155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362045.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 421505155 is about 20530.5907123979. The cubic root of 421505155 is about 749.7807685156.

The spelling of 421505155 in words is "four hundred twenty-one million, five hundred five thousand, one hundred fifty-five".