21822687 has 6 divisors (see below), whose sum is σ = 31521672. Its totient is φ = 14548452.

The previous prime is 21822683. The next prime is 21822707. The reversal of 21822687 is 78622812.

It is a happy number.

It is not a de Polignac number, because 21822687 - 2² = 21822683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822683) 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 5 ways as a sum of consecutive naturals, for example, 1212363 + ... + 1212380.

It is an arithmetic number, because the mean of its divisors is an integer number (5253612).

Almost surely, 2^21822687 is an apocalyptic number.

21822687 is a deficient number, since it is larger than the sum of its proper divisors (9698985).

21822687 is a wasteful number, since it uses less digits than its factorization.

21822687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424749 (or 2424746 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 21822687 is about 4671.4758909792. The cubic root of 21822687 is about 279.4491167107.

The spelling of 21822687 in words is "twenty-one million, eight hundred twenty-two thousand, six hundred eighty-seven".