421515220155 has 16 divisors (see below), whose sum is σ = 674432655360. Its totient is φ = 224805349728.

The previous prime is 421515220129. The next prime is 421515220187. The reversal of 421515220155 is 551022515124.

It is not a de Polignac number, because 421515220155 - 2¹¹ = 421515218107 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1846716 + ... + 2062374.

It is an arithmetic number, because the mean of its divisors is an integer number (42152040960).

Almost surely, 2^421515220155 is an apocalyptic number.

421515220155 is a deficient number, since it is larger than the sum of its proper divisors (252917435205).

421515220155 is a wasteful number, since it uses less digits than its factorization.

421515220155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345970.

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 421515220155 its reverse (551022515124), we get a palindrome (972537735279).

The spelling of 421515220155 in words is "four hundred twenty-one billion, five hundred fifteen million, two hundred twenty thousand, one hundred fifty-five".