15120321421 has 4 divisors (see below), whose sum is σ = 15120925344. Its totient is φ = 15119717500.

The previous prime is 15120321389. The next prime is 15120321451. The reversal of 15120321421 is 12412302151.

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 15120321421 - 2⁵ = 15120321389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15120321392 and 15120321401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15120321451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262705 + ... + 315046.

It is an arithmetic number, because the mean of its divisors is an integer number (3780231336).

Almost surely, 2^15120321421 is an apocalyptic number.

It is an amenable number.

15120321421 is a deficient number, since it is larger than the sum of its proper divisors (603923).

15120321421 is an equidigital number, since it uses as much as digits as its factorization.

15120321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603922.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 15120321421 its reverse (12412302151), we get a palindrome (27532623572).

The spelling of 15120321421 in words is "fifteen billion, one hundred twenty million, three hundred twenty-one thousand, four hundred twenty-one".