201212001220 has 24 divisors (see below), whose sum is σ = 422554537944. Its totient is φ = 80483022336.

The previous prime is 201212001191. The next prime is 201212001247. The reversal of 201212001220 is 22100212102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8125580164 + 193086421056 = 90142^2 + 439416^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 201212001220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1186044 + ... + 1345036.

It is an arithmetic number, because the mean of its divisors is an integer number (17606439081).

Almost surely, 2^201212001220 is an apocalyptic number.

201212001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212001220 is an abundant number, since it is smaller than the sum of its proper divisors (221342536724).

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

201212001220 is a wasteful number, since it uses less digits than its factorization.

201212001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222279 (or 222277 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201212001220 its reverse (22100212102), we get a palindrome (223312213322).

The spelling of 201212001220 in words is "two hundred one billion, two hundred twelve million, one thousand, two hundred twenty".