21163722 has 32 divisors (see below), whose sum is σ = 43298880. Its totient is φ = 6894720.

The previous prime is 21163699. The next prime is 21163729. The reversal of 21163722 is 22736112.

It is a junction number, because it is equal to n+sod(n) for n = 21163692 and 21163701.

It is not an unprimeable number, because it can be changed into a prime (21163729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92304 + ... + 92532.

It is an arithmetic number, because the mean of its divisors is an integer number (1353090).

Almost surely, 2^21163722 is an apocalyptic number.

21163722 is an abundant number, since it is smaller than the sum of its proper divisors (22135158).

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

21163722 is a wasteful number, since it uses less digits than its factorization.

21163722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its digits is 1008, while the sum is 24.

The square root of 21163722 is about 4600.4045474284. The cubic root of 21163722 is about 276.6075411145.

Adding to 21163722 its reverse (22736112), we get a palindrome (43899834).

The spelling of 21163722 in words is "twenty-one million, one hundred sixty-three thousand, seven hundred twenty-two".