16022247721 has 4 divisors (see below), whose sum is σ = 16037941444. Its totient is φ = 16006554000.

The previous prime is 16022247641. The next prime is 16022247727. The reversal of 16022247721 is 12774222061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12774222061 = 223 ⋅57283507.

It can be written as a sum of positive squares in 2 ways, for example, as 5616003600 + 10406244121 = 74940^2 + 102011^2 .

It is a cyclic number.

It is not a de Polignac number, because 16022247721 - 2¹³ = 16022239529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16022247727) 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, 7845330 + ... + 7847371.

It is an arithmetic number, because the mean of its divisors is an integer number (4009485361).

Almost surely, 2^16022247721 is an apocalyptic number.

It is an amenable number.

16022247721 is a deficient number, since it is larger than the sum of its proper divisors (15693723).

16022247721 is a wasteful number, since it uses less digits than its factorization.

16022247721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15693722.

The product of its (nonzero) digits is 18816, while the sum is 34.

Adding to 16022247721 its reverse (12774222061), we get a palindrome (28796469782).

The spelling of 16022247721 in words is "sixteen billion, twenty-two million, two hundred forty-seven thousand, seven hundred twenty-one".