21841442 has 16 divisors (see below), whose sum is σ = 37532160. Its totient is φ = 9338208.

The previous prime is 21841441. The next prime is 21841489. The reversal of 21841442 is 24414812.

It is not an unprimeable number, because it can be changed into a prime (21841441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5078 + ... + 8334.

It is an arithmetic number, because the mean of its divisors is an integer number (2345760).

Almost surely, 2^21841442 is an apocalyptic number.

21841442 is a deficient number, since it is larger than the sum of its proper divisors (15690718).

21841442 is a wasteful number, since it uses less digits than its factorization.

21841442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745.

The product of its digits is 2048, while the sum is 26.

The square root of 21841442 is about 4673.4828554302. The cubic root of 21841442 is about 279.5291491324.

The spelling of 21841442 in words is "twenty-one million, eight hundred forty-one thousand, four hundred forty-two".