221212121212122 has 64 divisors (see below), whose sum is σ = 455249170741248. Its totient is φ = 71607594240000.

The previous prime is 221212121212073. The next prime is 221212121212123.

221212121212122 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×221212121212122² (a number of 29 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221212121212092 and 221212121212101.

It is not an unprimeable number, because it can be changed into a prime (221212121212123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323507847 + ... + 324190917.

It is an arithmetic number, because the mean of its divisors is an integer number (7113268292832).

Almost surely, 2^{221212121212122} is an apocalyptic number.

221212121212122 is an abundant number, since it is smaller than the sum of its proper divisors (234037049529126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221212121212122 is a wasteful number, since it uses less digits than its factorization.

221212121212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685895.

The product of its digits is 512, while the sum is 24.

The spelling of 221212121212122 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-two".