1211101212 has 12 divisors (see below), whose sum is σ = 2825902856. Its totient is φ = 403700400.

The previous prime is 1211101187. The next prime is 1211101237. The reversal of 1211101212 is 2121011121.

It is an interprime number because it is at equal distance from previous prime (1211101187) and next prime (1211101237).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1211101212² = 2933532291415737888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 100925101 = 1211101212 / (1 + 2 + 1 + 1 + 1 + 0 + 1 + 2 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50462539 + ... + 50462562.

Almost surely, 2^1211101212 is an apocalyptic number.

1211101212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211101212 is an abundant number, since it is smaller than the sum of its proper divisors (1614801644).

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

1211101212 is a wasteful number, since it uses less digits than its factorization.

1211101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100925108 (or 100925106 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211101212 is about 34800.8794716455. The cubic root of 1211101212 is about 1065.9254043055.

Adding to 1211101212 its reverse (2121011121), we get a palindrome (3332112333).

Subtracting 1211101212 from its reverse (2121011121), we obtain a palindrome (909909909).

The spelling of 1211101212 in words is "one billion, two hundred eleven million, one hundred one thousand, two hundred twelve".