21722517348 has 96 divisors (see below), whose sum is σ = 60780195840. Its totient is φ = 5903694720.

The previous prime is 21722517319. The next prime is 21722517361. The reversal of 21722517348 is 84371522712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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, 318633 + ... + 380751.

It is an arithmetic number, because the mean of its divisors is an integer number (633127040).

Almost surely, 2^21722517348 is an apocalyptic number.

21722517348 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21722517348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30390097920).

21722517348 is an abundant number, since it is smaller than the sum of its proper divisors (39057678492).

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

21722517348 is a wasteful number, since it uses less digits than its factorization.

21722517348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62337 (or 62335 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The spelling of 21722517348 in words is "twenty-one billion, seven hundred twenty-two million, five hundred seventeen thousand, three hundred forty-eight".