1211217612 has 24 divisors (see below), whose sum is σ = 3083099712. Its totient is φ = 367035600.

The previous prime is 1211217583. The next prime is 1211217619. The reversal of 1211217612 is 2167121121.

It is not an unprimeable number, because it can be changed into a prime (1211217619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4587814 + ... + 4588077.

It is an arithmetic number, because the mean of its divisors is an integer number (128462488).

Almost surely, 2^1211217612 is an apocalyptic number.

1211217612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211217612 is an abundant number, since it is smaller than the sum of its proper divisors (1871882100).

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

1211217612 is a wasteful number, since it uses less digits than its factorization.

1211217612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175909 (or 9175907 counting only the distinct ones).

The product of its digits is 336, while the sum is 24.

The square root of 1211217612 is about 34802.5518029928. The cubic root of 1211217612 is about 1065.9595522202.

Adding to 1211217612 its reverse (2167121121), we get a palindrome (3378338733).

The spelling of 1211217612 in words is "one billion, two hundred eleven million, two hundred seventeen thousand, six hundred twelve".