1315157472421 has 4 divisors (see below), whose sum is σ = 1416323431852. Its totient is φ = 1213991512992.

The previous prime is 1315157472287. The next prime is 1315157472511. The reversal of 1315157472421 is 1242747515131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576021799521 + 739135672900 = 758961^2 + 859730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315157472421 - 2¹¹ = 1315157470373 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 (1315157412421) 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, 50582979696 + ... + 50582979721.

It is an arithmetic number, because the mean of its divisors is an integer number (354080857963).

Almost surely, 2^{1315157472421} is an apocalyptic number.

It is an amenable number.

1315157472421 is a deficient number, since it is larger than the sum of its proper divisors (101165959431).

1315157472421 is a wasteful number, since it uses less digits than its factorization.

1315157472421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101165959430.

The product of its digits is 235200, while the sum is 43.

The spelling of 1315157472421 in words is "one trillion, three hundred fifteen billion, one hundred fifty-seven million, four hundred seventy-two thousand, four hundred twenty-one".