1215421124 has 24 divisors (see below), whose sum is σ = 2155029408. Its totient is φ = 599715200.

The previous prime is 1215421121. The next prime is 1215421147. The reversal of 1215421124 is 4211245121.

It is a self number, because there is not a number n which added to its sum of digits gives 1215421124.

It is not an unprimeable number, because it can be changed into a prime (1215421121) 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, 432524 + ... + 435324.

It is an arithmetic number, because the mean of its divisors is an integer number (89792892).

Almost surely, 2^1215421124 is an apocalyptic number.

It is an amenable number.

1215421124 is a deficient number, since it is larger than the sum of its proper divisors (939608284).

1215421124 is a wasteful number, since it uses less digits than its factorization.

1215421124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195 (or 4193 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 1215421124 is about 34862.8903563660. The cubic root of 1215421124 is about 1067.1912604919.

Adding to 1215421124 its reverse (4211245121), we get a palindrome (5426666245).

It can be divided in two parts, 121 and 5421124, that added together give a palindrome (5421245).

The spelling of 1215421124 in words is "one billion, two hundred fifteen million, four hundred twenty-one thousand, one hundred twenty-four".