1211201220212 has 6 divisors (see below), whose sum is σ = 2119602135378. Its totient is φ = 605600610104.

The previous prime is 1211201220167. The next prime is 1211201220253. The reversal of 1211201220212 is 2120221021121.

It can be written as a sum of positive squares in only one way, i.e., 745867140496 + 465334079716 = 863636^2 + 682154^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151400152523 + ... + 151400152530.

It is an arithmetic number, because the mean of its divisors is an integer number (353267022563).

Almost surely, 2^{1211201220212} is an apocalyptic number.

It is an amenable number.

1211201220212 is a deficient number, since it is larger than the sum of its proper divisors (908400915166).

1211201220212 is a wasteful number, since it uses less digits than its factorization.

1211201220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302800305057 (or 302800305055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211201220212 its reverse (2120221021121), we get a palindrome (3331422241333).

The spelling of 1211201220212 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred twenty thousand, two hundred twelve".