15201221646113 has 4 divisors (see below), whose sum is σ = 15213125501460. Its totient is φ = 15189317790768.

The previous prime is 15201221646103. The next prime is 15201221646131. The reversal of 15201221646113 is 31164612210251.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10161412163809 + 5039809482304 = 3187697^2 + 2244952^2 .

It is a cyclic number.

It is not a de Polignac number, because 15201221646113 - 2¹⁴ = 15201221629729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15201221646103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5951925758 + ... + 5951928311.

It is an arithmetic number, because the mean of its divisors is an integer number (3803281375365).

Almost surely, 2^{15201221646113} is an apocalyptic number.

It is an amenable number.

15201221646113 is a deficient number, since it is larger than the sum of its proper divisors (11903855347).

15201221646113 is a wasteful number, since it uses less digits than its factorization.

15201221646113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11903855346.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 15201221646113 its reverse (31164612210251), we get a palindrome (46365833856364).

The spelling of 15201221646113 in words is "fifteen trillion, two hundred one billion, two hundred twenty-one million, six hundred forty-six thousand, one hundred thirteen".