21839822 has 8 divisors (see below), whose sum is σ = 32941272. Its totient is φ = 10859400.

The previous prime is 21839801. The next prime is 21839827. The reversal of 21839822 is 22893812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29804 + ... + 30527.

It is an arithmetic number, because the mean of its divisors is an integer number (4117659).

Almost surely, 2^21839822 is an apocalyptic number.

21839822 is a deficient number, since it is larger than the sum of its proper divisors (11101450).

21839822 is a wasteful number, since it uses less digits than its factorization.

21839822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60514.

The product of its digits is 13824, while the sum is 35.

The square root of 21839822 is about 4673.3095339384. The cubic root of 21839822 is about 279.5222379828.

It can be divided in two parts, 2183 and 9822, that multiplied together give a triangular number (21441426 = T₆₅₄₈).

The spelling of 21839822 in words is "twenty-one million, eight hundred thirty-nine thousand, eight hundred twenty-two".