21722221063 has 8 divisors (see below), whose sum is σ = 21774119040. Its totient is φ = 21670379640.

The previous prime is 21722221057. The next prime is 21722221069. The reversal of 21722221063 is 36012222712.

It is an interprime number because it is at equal distance from previous prime (21722221057) and next prime (21722221069).

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 21722221063 - 2²¹ = 21720123911 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 (21722221069) 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, 811548 + ... + 837886.

It is an arithmetic number, because the mean of its divisors is an integer number (2721764880).

Almost surely, 2^21722221063 is an apocalyptic number.

21722221063 is a deficient number, since it is larger than the sum of its proper divisors (51897977).

21722221063 is a wasteful number, since it uses less digits than its factorization.

21722221063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28277.

The product of its (nonzero) digits is 4032, while the sum is 28.

Adding to 21722221063 its reverse (36012222712), we get a palindrome (57734443775).

The spelling of 21722221063 in words is "twenty-one billion, seven hundred twenty-two million, two hundred twenty-one thousand, sixty-three".