1215452100 has 72 divisors (see below), whose sum is σ = 3520517728. Its totient is φ = 323769600.

The previous prime is 1215452099. The next prime is 1215452113. The reversal of 1215452100 is 12545121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 394767 + ... + 397833.

Almost surely, 2^1215452100 is an apocalyptic number.

1215452100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215452100 is an abundant number, since it is smaller than the sum of its proper divisors (2305065628).

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

1215452100 is a wasteful number, since it uses less digits than its factorization.

1215452100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405 (or 4398 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1215452100 is about 34863.3346081524. The cubic root of 1215452100 is about 1067.2003264952.

Adding to 1215452100 its reverse (12545121), we get a palindrome (1227997221).

The spelling of 1215452100 in words is "one billion, two hundred fifteen million, four hundred fifty-two thousand, one hundred".