15221032561 has 8 divisors (see below), whose sum is σ = 17451044864. Its totient is φ = 13004915040.

The previous prime is 15221032559. The next prime is 15221032591. The reversal of 15221032561 is 16523012251.

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 15221032561 - 2¹ = 15221032559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15221032511) 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, 3471345 + ... + 3475726.

It is an arithmetic number, because the mean of its divisors is an integer number (2181380608).

Almost surely, 2^15221032561 is an apocalyptic number.

It is an amenable number.

15221032561 is a deficient number, since it is larger than the sum of its proper divisors (2230012303).

15221032561 is an equidigital number, since it uses as much as digits as its factorization.

15221032561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947391.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 15221032561 in words is "fifteen billion, two hundred twenty-one million, thirty-two thousand, five hundred sixty-one".