4155511422221 has 4 divisors (see below), whose sum is σ = 4243926558912. Its totient is φ = 4067096285532.

The previous prime is 4155511422169. The next prime is 4155511422229. The reversal of 4155511422221 is 1222241155514.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4155511422221 - 2²² = 4155507227917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4155511422229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44207568275 + ... + 44207568368.

It is an arithmetic number, because the mean of its divisors is an integer number (1060981639728).

Almost surely, 2^{4155511422221} is an apocalyptic number.

It is an amenable number.

4155511422221 is a deficient number, since it is larger than the sum of its proper divisors (88415136691).

4155511422221 is an equidigital number, since it uses as much as digits as its factorization.

4155511422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88415136690.

The product of its digits is 32000, while the sum is 35.

Adding to 4155511422221 its reverse (1222241155514), we get a palindrome (5377752577735).

The spelling of 4155511422221 in words is "four trillion, one hundred fifty-five billion, five hundred eleven million, four hundred twenty-two thousand, two hundred twenty-one".