201212122122 has 24 divisors (see below), whose sum is σ = 475592289120. Its totient is φ = 60973370280.

The previous prime is 201212122081. The next prime is 201212122141. The reversal of 201212122122 is 221221212102.

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 = 201212122095 and 201212122104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 508111222 + ... + 508111617.

It is an arithmetic number, because the mean of its divisors is an integer number (19816345380).

Almost surely, 2^201212122122 is an apocalyptic number.

201212122122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

201212122122 is an abundant number, since it is smaller than the sum of its proper divisors (274380166998).

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

201212122122 is a wasteful number, since it uses less digits than its factorization.

201212122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016222858 (or 1016222855 counting only the distinct ones).

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

Adding to 201212122122 its reverse (221221212102), we get a palindrome (422433334224).

The spelling of 201212122122 in words is "two hundred one billion, two hundred twelve million, one hundred twenty-two thousand, one hundred twenty-two".