21841490 has 64 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 7434240.

The previous prime is 21841489. The next prime is 21841537. The reversal of 21841490 is 9414812.

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 31 ways as a sum of consecutive naturals, for example, 225122 + ... + 225218.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^21841490 is an apocalyptic number.

21841490 is an abundant number, since it is smaller than the sum of its proper divisors (23881390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21841490 is a wasteful number, since it uses less digits than its factorization.

21841490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 21841490 is about 4673.4879907838. The cubic root of 21841490 is about 279.5293539020.

The spelling of 21841490 in words is "twenty-one million, eight hundred forty-one thousand, four hundred ninety".