21722727215 has 64 divisors (see below), whose sum is σ = 31045496832. Its totient is φ = 14282956800.

The previous prime is 21722727157. The next prime is 21722727217. The reversal of 21722727215 is 51272722712.

It is not a de Polignac number, because 21722727215 - 2¹² = 21722723119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722727217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32277119 + ... + 32277791.

It is an arithmetic number, because the mean of its divisors is an integer number (485085888).

Almost surely, 2^21722727215 is an apocalyptic number.

21722727215 is a deficient number, since it is larger than the sum of its proper divisors (9322769617).

21722727215 is a wasteful number, since it uses less digits than its factorization.

21722727215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080.

The product of its digits is 54880, while the sum is 38.

It can be divided in two parts, 217227 and 27215, that added together give a palindrome (244442).

The spelling of 21722727215 in words is "twenty-one billion, seven hundred twenty-two million, seven hundred twenty-seven thousand, two hundred fifteen".