15212430021 has 8 divisors (see below), whose sum is σ = 20338509184. Its totient is φ = 10113985440.

The previous prime is 15212430011. The next prime is 15212430053. The reversal of 15212430021 is 12003421251.

15212430021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 15212430021 - 2⁹ = 15212429509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15212430021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15212430011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6907360 + ... + 6909561.

It is an arithmetic number, because the mean of its divisors is an integer number (2542313648).

Almost surely, 2^15212430021 is an apocalyptic number.

It is an amenable number.

15212430021 is a deficient number, since it is larger than the sum of its proper divisors (5126079163).

15212430021 is a wasteful number, since it uses less digits than its factorization.

15212430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13817291.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 15212430021 its reverse (12003421251), we get a palindrome (27215851272).

The spelling of 15212430021 in words is "fifteen billion, two hundred twelve million, four hundred thirty thousand, twenty-one".