15212425421 has 8 divisors (see below), whose sum is σ = 15888380640. Its totient is φ = 14550407568.

The previous prime is 15212425391. The next prime is 15212425427. The reversal of 15212425421 is 12452421251.

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 15212425421 - 2⁶ = 15212425357 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 (15212425427) 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, 3482111 + ... + 3486476.

It is an arithmetic number, because the mean of its divisors is an integer number (1986047580).

Almost surely, 2^15212425421 is an apocalyptic number.

It is an amenable number.

15212425421 is a deficient number, since it is larger than the sum of its proper divisors (675955219).

15212425421 is an equidigital number, since it uses as much as digits as its factorization.

15212425421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6968683.

The product of its digits is 6400, while the sum is 29.

Adding to 15212425421 its reverse (12452421251), we get a palindrome (27664846672).

The spelling of 15212425421 in words is "fifteen billion, two hundred twelve million, four hundred twenty-five thousand, four hundred twenty-one".