15421440031 has 4 divisors (see below), whose sum is σ = 15433405200. Its totient is φ = 15409474864.

The previous prime is 15421439987. The next prime is 15421440059. The reversal of 15421440031 is 13004412451.

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

It is a cyclic number.

It is not a de Polignac number, because 15421440031 - 2⁹ = 15421439519 is a prime.

It is a super-2 number, since 2×15421440031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15421439978 and 15421440005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421440071) 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, 5980651 + ... + 5983228.

It is an arithmetic number, because the mean of its divisors is an integer number (3858351300).

Almost surely, 2^15421440031 is an apocalyptic number.

15421440031 is a deficient number, since it is larger than the sum of its proper divisors (11965169).

15421440031 is a wasteful number, since it uses less digits than its factorization.

15421440031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11965168.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 15421440031 its reverse (13004412451), we get a palindrome (28425852482).

The spelling of 15421440031 in words is "fifteen billion, four hundred twenty-one million, four hundred forty thousand, thirty-one".