1215121134 has 16 divisors (see below), whose sum is σ = 2455297488. Its totient is φ = 400864512.

The previous prime is 1215121097. The next prime is 1215121139. The reversal of 1215121134 is 4311215121.

It is a self number, because there is not a number n which added to its sum of digits gives 1215121134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215121139) 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, 1043337 + ... + 1044500.

It is an arithmetic number, because the mean of its divisors is an integer number (153456093).

Almost surely, 2^1215121134 is an apocalyptic number.

1215121134 is an abundant number, since it is smaller than the sum of its proper divisors (1240176354).

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

1215121134 is a wasteful number, since it uses less digits than its factorization.

1215121134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087939.

The product of its digits is 240, while the sum is 21.

The square root of 1215121134 is about 34858.5876650217. The cubic root of 1215121134 is about 1067.1034519557.

Adding to 1215121134 its reverse (4311215121), we get a palindrome (5526336255).

The spelling of 1215121134 in words is "one billion, two hundred fifteen million, one hundred twenty-one thousand, one hundred thirty-four".