15216061662221 has 8 divisors (see below), whose sum is σ = 17411881058880. Its totient is φ = 13025766341088.

The previous prime is 15216061662101. The next prime is 15216061662259. The reversal of 15216061662221 is 12226616061251.

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 15216061662221 - 2¹⁰ = 15216061661197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15216061661221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381012976 + ... + 1381023993.

It is an arithmetic number, because the mean of its divisors is an integer number (2176485132360).

Almost surely, 2^{15216061662221} is an apocalyptic number.

It is an amenable number.

15216061662221 is a deficient number, since it is larger than the sum of its proper divisors (2195819396659).

15216061662221 is an equidigital number, since it uses as much as digits as its factorization.

15216061662221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762037763.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 15216061662221 in words is "fifteen trillion, two hundred sixteen billion, sixty-one million, six hundred sixty-two thousand, two hundred twenty-one".