21875722 has 16 divisors (see below), whose sum is σ = 36135072. Its totient is φ = 9849520.

The previous prime is 21875713. The next prime is 21875747. The reversal of 21875722 is 22757812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2293 + ... + 7000.

It is an arithmetic number, because the mean of its divisors is an integer number (2258442).

Almost surely, 2^21875722 is an apocalyptic number.

21875722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21875722 is a deficient number, since it is larger than the sum of its proper divisors (14259350).

21875722 is a wasteful number, since it uses less digits than its factorization.

21875722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9413.

The product of its digits is 15680, while the sum is 34.

The square root of 21875722 is about 4677.1489178772. The cubic root of 21875722 is about 279.6753124138.

The spelling of 21875722 in words is "twenty-one million, eight hundred seventy-five thousand, seven hundred twenty-two".