1215623332421 has 4 divisors (see below), whose sum is σ = 1217295442272. Its totient is φ = 1213951222572.

The previous prime is 1215623332397. The next prime is 1215623332471. The reversal of 1215623332421 is 1242333265121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215623332421 - 2³⁴ = 1198443463237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215623332471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836053835 + ... + 836055288.

It is an arithmetic number, because the mean of its divisors is an integer number (304323860568).

Almost surely, 2^{1215623332421} is an apocalyptic number.

It is an amenable number.

1215623332421 is a deficient number, since it is larger than the sum of its proper divisors (1672109851).

1215623332421 is an equidigital number, since it uses as much as digits as its factorization.

1215623332421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672109850.

The product of its digits is 51840, while the sum is 35.

Adding to 1215623332421 its reverse (1242333265121), we get a palindrome (2457956597542).

The spelling of 1215623332421 in words is "one trillion, two hundred fifteen billion, six hundred twenty-three million, three hundred thirty-two thousand, four hundred twenty-one".