15245210221 has 8 divisors (see below), whose sum is σ = 15909359040. Its totient is φ = 14581170912.

The previous prime is 15245210179. The next prime is 15245210243. The reversal of 15245210221 is 12201254251.

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 15245210221 - 2⁹ = 15245209709 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 (15245210621) 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, 397726 + ... + 434368.

It is an arithmetic number, because the mean of its divisors is an integer number (1988669880).

Almost surely, 2^15245210221 is an apocalyptic number.

It is an amenable number.

15245210221 is a deficient number, since it is larger than the sum of its proper divisors (664148819).

15245210221 is a wasteful number, since it uses less digits than its factorization.

15245210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54755.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 15245210221 its reverse (12201254251), we get a palindrome (27446464472).

The spelling of 15245210221 in words is "fifteen billion, two hundred forty-five million, two hundred ten thousand, two hundred twenty-one".