1215253020 has 96 divisors (see below), whose sum is σ = 3452375808. Its totient is φ = 319375872.

The previous prime is 1215253003. The next prime is 1215253043. The reversal of 1215253020 is 203525121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1339407 + ... + 1340313.

It is an arithmetic number, because the mean of its divisors is an integer number (35962248).

Almost surely, 2^1215253020 is an apocalyptic number.

1215253020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215253020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1726187904).

1215253020 is an abundant number, since it is smaller than the sum of its proper divisors (2237122788).

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

1215253020 is a wasteful number, since it uses less digits than its factorization.

1215253020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1215253020 is about 34860.4793426596. The cubic root of 1215253020 is about 1067.1420574112.

Adding to 1215253020 its reverse (203525121), we get a palindrome (1418778141).

The spelling of 1215253020 in words is "one billion, two hundred fifteen million, two hundred fifty-three thousand, twenty".