1215121452 has 48 divisors (see below), whose sum is σ = 2859494400. Its totient is φ = 401596480.

The previous prime is 1215121351. The next prime is 1215121463. The reversal of 1215121452 is 2541215121.

It is a happy number.

It is a super-2 number, since 2×1215121452² = 2953040286221176608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1028302 + ... + 1029482.

It is an arithmetic number, because the mean of its divisors is an integer number (59572800).

Almost surely, 2^1215121452 is an apocalyptic number.

1215121452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215121452 is an abundant number, since it is smaller than the sum of its proper divisors (1644372948).

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

1215121452 is a wasteful number, since it uses less digits than its factorization.

1215121452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846 (or 1844 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1215121452 is about 34858.5922263077. The cubic root of 1215121452 is about 1067.1035450435.

Adding to 1215121452 its reverse (2541215121), we get a palindrome (3756336573).

The spelling of 1215121452 in words is "one billion, two hundred fifteen million, one hundred twenty-one thousand, four hundred fifty-two".