421216755 has 8 divisors (see below), whose sum is σ = 673946832. Its totient is φ = 224648928.

The previous prime is 421216751. The next prime is 421216781. The reversal of 421216755 is 557612124.

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

It is not a de Polignac number, because 421216755 - 2² = 421216751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421216751) 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, 14040544 + ... + 14040573.

It is an arithmetic number, because the mean of its divisors is an integer number (84243354).

Almost surely, 2^421216755 is an apocalyptic number.

421216755 is a deficient number, since it is larger than the sum of its proper divisors (252730077).

421216755 is a wasteful number, since it uses less digits than its factorization.

421216755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28081125.

The product of its digits is 16800, while the sum is 33.

The square root of 421216755 is about 20523.5658451449. The cubic root of 421216755 is about 749.6097258389.

Adding to 421216755 its reverse (557612124), we get a palindrome (978828879).

The spelling of 421216755 in words is "four hundred twenty-one million, two hundred sixteen thousand, seven hundred fifty-five".