221212122 has 32 divisors (see below), whose sum is σ = 462110400. Its totient is φ = 70524288.

The previous prime is 221212111. The next prime is 221212129.

221212122 is nontrivially palindromic in base 10.

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

It is not an unprimeable number, because it can be changed into a prime (221212129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4654 + ... + 21542.

It is an arithmetic number, because the mean of its divisors is an integer number (14440950).

Almost surely, 2^221212122 is an apocalyptic number.

221212122 is an abundant number, since it is smaller than the sum of its proper divisors (240898278).

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

221212122 is a wasteful number, since it uses less digits than its factorization.

221212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16990.

The product of its digits is 64, while the sum is 15.

The square root of 221212122 is about 14873.2014711023. The cubic root of 221212122 is about 604.7877332886.

The spelling of 221212122 in words is "two hundred twenty-one million, two hundred twelve thousand, one hundred twenty-two".