421216155 has 24 divisors (see below), whose sum is σ = 755286480. Its totient is φ = 216901440.

The previous prime is 421216153. The next prime is 421216171. The reversal of 421216155 is 551612124.

421216155 is a `hidden beast` number, since 4 + 21 + 21 + 615 + 5 = 666.

It is not a de Polignac number, because 421216155 - 2¹ = 421216153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421216153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160081 + ... + 162690.

It is an arithmetic number, because the mean of its divisors is an integer number (31470270).

Almost surely, 2^421216155 is an apocalyptic number.

421216155 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

421216155 is a deficient number, since it is larger than the sum of its proper divisors (334070325).

421216155 is a wasteful number, since it uses less digits than its factorization.

421216155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322811 (or 322808 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 421216155 is about 20523.5512277968. The cubic root of 421216155 is about 749.6093699128.

Adding to 421216155 its reverse (551612124), we get a palindrome (972828279).

The spelling of 421216155 in words is "four hundred twenty-one million, two hundred sixteen thousand, one hundred fifty-five".