1215222012 has 18 divisors (see below), whose sum is σ = 3071811288. Its totient is φ = 405073992.

The previous prime is 1215221993. The next prime is 1215222017. The reversal of 1215222012 is 2102225121.

1215222012 is a `hidden beast` number, since 121 + 522 + 20 + 1 + 2 = 666.

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 not an unprimeable number, because it can be changed into a prime (1215222017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16878048 + ... + 16878119.

Almost surely, 2^1215222012 is an apocalyptic number.

1215222012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215222012 is an abundant number, since it is smaller than the sum of its proper divisors (1856589276).

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

1215222012 is a wasteful number, since it uses less digits than its factorization.

1215222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33756177 (or 33756172 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1215222012 is about 34860.0345955078. The cubic root of 1215222012 is about 1067.1329810510.

Adding to 1215222012 its reverse (2102225121), we get a palindrome (3317447133).

The spelling of 1215222012 in words is "one billion, two hundred fifteen million, two hundred twenty-two thousand, twelve".