1215216252 has 36 divisors (see below), whose sum is σ = 3117650536. Its totient is φ = 399025440.

The previous prime is 1215216241. The next prime is 1215216283. The reversal of 1215216252 is 2526125121.

1215216252 is a `hidden beast` number, since 1 + 2 + 15 + 21 + 625 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249499 + ... + 254322.

Almost surely, 2^1215216252 is an apocalyptic number.

1215216252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215216252 is an abundant number, since it is smaller than the sum of its proper divisors (1902434284).

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

1215216252 is a wasteful number, since it uses less digits than its factorization.

1215216252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503898 (or 503893 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 1215216252 is about 34859.9519793129. The cubic root of 1215216252 is about 1067.1312950228.

The spelling of 1215216252 in words is "one billion, two hundred fifteen million, two hundred sixteen thousand, two hundred fifty-two".