15312012421 has 8 divisors (see below), whose sum is σ = 16336482624. Its totient is φ = 14301293760.

The previous prime is 15312012413. The next prime is 15312012427. The reversal of 15312012421 is 12421021351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15312012421 - 2³ = 15312012413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15312012392 and 15312012401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15312012427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3435585 + ... + 3440038.

It is an arithmetic number, because the mean of its divisors is an integer number (2042060328).

Almost surely, 2^15312012421 is an apocalyptic number.

It is an amenable number.

15312012421 is a deficient number, since it is larger than the sum of its proper divisors (1024470203).

15312012421 is a wasteful number, since it uses less digits than its factorization.

15312012421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875771.

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

Adding to 15312012421 its reverse (12421021351), we get a palindrome (27733033772).

The spelling of 15312012421 in words is "fifteen billion, three hundred twelve million, twelve thousand, four hundred twenty-one".