15040315421 has 4 divisors (see below), whose sum is σ = 15077822844. Its totient is φ = 15002808000.

The previous prime is 15040315403. The next prime is 15040315427. The reversal of 15040315421 is 12451304051.

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 14865705625 + 174609796 = 121925^2 + 13214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15040315421 is a prime.

It is a super-2 number, since 2×15040315421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15040315427) 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, 18753110 + ... + 18753911.

It is an arithmetic number, because the mean of its divisors is an integer number (3769455711).

Almost surely, 2^15040315421 is an apocalyptic number.

It is an amenable number.

15040315421 is a deficient number, since it is larger than the sum of its proper divisors (37507423).

15040315421 is an equidigital number, since it uses as much as digits as its factorization.

15040315421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37507422.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 15040315421 its reverse (12451304051), we get a palindrome (27491619472).

The spelling of 15040315421 in words is "fifteen billion, forty million, three hundred fifteen thousand, four hundred twenty-one".