1151221212 has 18 divisors (see below), whose sum is σ = 2910031488. Its totient is φ = 383740392.

The previous prime is 1151221189. The next prime is 1151221273. The reversal of 1151221212 is 2121221511.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15989148 + ... + 15989219.

It is an arithmetic number, because the mean of its divisors is an integer number (161668416).

Almost surely, 2^1151221212 is an apocalyptic number.

1151221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1151221212 is an abundant number, since it is smaller than the sum of its proper divisors (1758810276).

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

1151221212 is a wasteful number, since it uses less digits than its factorization.

1151221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31978377 (or 31978372 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 1151221212 is about 33929.6509265863. The cubic root of 1151221212 is about 1048.0602773538.

Adding to 1151221212 its reverse (2121221511), we get a palindrome (3272442723).

The spelling of 1151221212 in words is "one billion, one hundred fifty-one million, two hundred twenty-one thousand, two hundred twelve".