22471821 has 6 divisors (see below), whose sum is σ = 32459310. Its totient is φ = 14981208.

The previous prime is 22471817. The next prime is 22471831. The reversal of 22471821 is 12817422.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 3861225 = 4314^2 + 1965^2 .

It is not a de Polignac number, because 22471821 - 2² = 22471817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22471831) 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 5 ways as a sum of consecutive naturals, for example, 1248426 + ... + 1248443.

It is an arithmetic number, because the mean of its divisors is an integer number (5409885).

Almost surely, 2^22471821 is an apocalyptic number.

It is an amenable number.

22471821 is a deficient number, since it is larger than the sum of its proper divisors (9987489).

22471821 is a wasteful number, since it uses less digits than its factorization.

22471821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496875 (or 2496872 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 22471821 is about 4740.4452322540. The cubic root of 22471821 is about 282.1929040771.

The spelling of 22471821 in words is "twenty-two million, four hundred seventy-one thousand, eight hundred twenty-one".