15244254221 has 6 divisors (see below), whose sum is σ = 17733112110. Its totient is φ = 13066503576.

The previous prime is 15244254217. The next prime is 15244254253. The reversal of 15244254221 is 12245244251.

It can be written as a sum of positive squares in only one way, i.e., 15023404900 + 220849321 = 122570^2 + 14861^2 .

It is not a de Polignac number, because 15244254221 - 2² = 15244254217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15244254281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 155553566 + ... + 155553663.

It is an arithmetic number, because the mean of its divisors is an integer number (2955518685).

Almost surely, 2^15244254221 is an apocalyptic number.

It is an amenable number.

15244254221 is a deficient number, since it is larger than the sum of its proper divisors (2488857889).

15244254221 is an equidigital number, since it uses as much as digits as its factorization.

15244254221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311107243 (or 311107236 counting only the distinct ones).

The product of its digits is 25600, while the sum is 32.

Adding to 15244254221 its reverse (12245244251), we get a palindrome (27489498472).

The spelling of 15244254221 in words is "fifteen billion, two hundred forty-four million, two hundred fifty-four thousand, two hundred twenty-one".