15641012221 has 8 divisors (see below), whose sum is σ = 16184401920. Its totient is φ = 15097892208.

The previous prime is 15641012209. The next prime is 15641012251. The reversal of 15641012221 is 12221014651.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15641012221 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 (15641012251) 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, 54340 + ... + 185026.

It is an arithmetic number, because the mean of its divisors is an integer number (2023050240).

Almost surely, 2^15641012221 is an apocalyptic number.

It is an amenable number.

15641012221 is a deficient number, since it is larger than the sum of its proper divisors (543389699).

15641012221 is a wasteful number, since it uses less digits than its factorization.

15641012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134843.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 15641012221 its reverse (12221014651), we get a palindrome (27862026872).

The spelling of 15641012221 in words is "fifteen billion, six hundred forty-one million, twelve thousand, two hundred twenty-one".