21741394 has 8 divisors (see below), whose sum is σ = 34030080. Its totient is φ = 10398036.

The previous prime is 21741389. The next prime is 21741397. The reversal of 21741394 is 49314712.

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

It is not an unprimeable number, because it can be changed into a prime (21741397) 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, 236274 + ... + 236365.

It is an arithmetic number, because the mean of its divisors is an integer number (4253760).

Almost surely, 2^21741394 is an apocalyptic number.

21741394 is a deficient number, since it is larger than the sum of its proper divisors (12288686).

21741394 is a wasteful number, since it uses less digits than its factorization.

21741394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472664.

The product of its digits is 6048, while the sum is 31.

The square root of 21741394 is about 4662.7667752098. The cubic root of 21741394 is about 279.1016873888.

The spelling of 21741394 in words is "twenty-one million, seven hundred forty-one thousand, three hundred ninety-four".