201121212222 has 64 divisors (see below), whose sum is σ = 511037721600. Its totient is φ = 57434663520.

The previous prime is 201121212211. The next prime is 201121212239. The reversal of 201121212222 is 222212121102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201121212195 and 201121212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 635847 + ... + 898077.

It is an arithmetic number, because the mean of its divisors is an integer number (7984964400).

Almost surely, 2^201121212222 is an apocalyptic number.

201121212222 is an abundant number, since it is smaller than the sum of its proper divisors (309916509378).

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

201121212222 is a wasteful number, since it uses less digits than its factorization.

201121212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264278 (or 264272 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201121212222 its reverse (222212121102), we get a palindrome (423333333324).

The spelling of 201121212222 in words is "two hundred one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".