21722221062 has 64 divisors (see below), whose sum is σ = 50395392000. Its totient is φ = 6922485504.

The previous prime is 21722221057. The next prime is 21722221069. The reversal of 21722221062 is 26012222712.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3933139 + ... + 3938657.

It is an arithmetic number, because the mean of its divisors is an integer number (787428000).

Almost surely, 2^21722221062 is an apocalyptic number.

21722221062 is an abundant number, since it is smaller than the sum of its proper divisors (28673170938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21722221062 is a wasteful number, since it uses less digits than its factorization.

21722221062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8716 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 21722221062 its reverse (26012222712), we get a palindrome (47734443774).

The spelling of 21722221062 in words is "twenty-one billion, seven hundred twenty-two million, two hundred twenty-one thousand, sixty-two".