1211220212 has 12 divisors (see below), whose sum is σ = 2120036100. Its totient is φ = 605495616.

The previous prime is 1211220193. The next prime is 1211220217. The reversal of 1211220212 is 2120221121.

It can be written as a sum of positive squares in 2 ways, for example, as 609793636 + 601426576 = 24694^2 + 24524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087 + ... + 49262.

It is an arithmetic number, because the mean of its divisors is an integer number (176669675).

Almost surely, 2^1211220212 is an apocalyptic number.

It is an amenable number.

1211220212 is a deficient number, since it is larger than the sum of its proper divisors (908815888).

1211220212 is a wasteful number, since it uses less digits than its factorization.

1211220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57250 (or 57248 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1211220212 is about 34802.5891565556. The cubic root of 1211220212 is about 1065.9603149493.

Adding to 1211220212 its reverse (2120221121), we get a palindrome (3331441333).

Subtracting 1211220212 from its reverse (2120221121), we obtain a palindrome (909000909).

The spelling of 1211220212 in words is "one billion, two hundred eleven million, two hundred twenty thousand, two hundred twelve".