1215451452213 has 12 divisors (see below), whose sum is σ = 1803102154828. Its totient is φ = 788400941760.

The previous prime is 1215451452157. The next prime is 1215451452221. The reversal of 1215451452213 is 3122541545121.

1215451452213 is a `hidden beast` number, since 1 + 2 + 154 + 51 + 452 + 2 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1095775584849 + 119675867364 = 1046793^2 + 345942^2 .

It is not a de Polignac number, because 1215451452213 - 2¹² = 1215451448117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215451452263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1825001848 + ... + 1825002513.

Almost surely, 2^{1215451452213} is an apocalyptic number.

It is an amenable number.

1215451452213 is a deficient number, since it is larger than the sum of its proper divisors (587650702615).

1215451452213 is a wasteful number, since it uses less digits than its factorization.

1215451452213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3650004404 (or 3650004401 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 1215451452213 its reverse (3122541545121), we get a palindrome (4337992997334).

The spelling of 1215451452213 in words is "one trillion, two hundred fifteen billion, four hundred fifty-one million, four hundred fifty-two thousand, two hundred thirteen".