201220121212 has 96 divisors (see below), whose sum is σ = 399458304000. Its totient is φ = 87864004800.

The previous prime is 201220121177. The next prime is 201220121287. The reversal of 201220121212 is 212121022102.

It is a happy number.

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, 233163093 + ... + 233163955.

It is an arithmetic number, because the mean of its divisors is an integer number (4161024000).

Almost surely, 2^201220121212 is an apocalyptic number.

201220121212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

201220121212 is a deficient number, since it is larger than the sum of its proper divisors (198238182788).

201220121212 is a wasteful number, since it uses less digits than its factorization.

201220121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967 (or 1965 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201220121212 its reverse (212121022102), we get a palindrome (413341143314).

The spelling of 201220121212 in words is "two hundred one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twelve".