221213312122 has 16 divisors (see below), whose sum is σ = 364382679744. Its totient is φ = 99885600000.

The previous prime is 221213312101. The next prime is 221213312129.

221213312122 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221213312093 and 221213312102.

It is not an unprimeable number, because it can be changed into a prime (221213312129) 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, 33291879 + ... + 33298522.

It is an arithmetic number, because the mean of its divisors is an integer number (22773917484).

Almost surely, 2^221213312122 is an apocalyptic number.

221213312122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221213312122 is a deficient number, since it is larger than the sum of its proper divisors (143169367622).

221213312122 is a wasteful number, since it uses less digits than its factorization.

221213312122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66590565.

The product of its digits is 576, while the sum is 22.

It can be divided in two parts, 221213 and 312122, that added together give a palindrome (533335).

The spelling of 221213312122 in words is "two hundred twenty-one billion, two hundred thirteen million, three hundred twelve thousand, one hundred twenty-two".