21994270 has 8 divisors (see below), whose sum is σ = 39589704. Its totient is φ = 8797704.

The previous prime is 21994237. The next prime is 21994319. The reversal of 21994270 is 7249912.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099704 + ... + 1099723.

It is an arithmetic number, because the mean of its divisors is an integer number (4948713).

Almost surely, 2^21994270 is an apocalyptic number.

21994270 is a deficient number, since it is larger than the sum of its proper divisors (17595434).

21994270 is a wasteful number, since it uses less digits than its factorization.

21994270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199434.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 21994270 is about 4689.8048999932. The cubic root of 21994270 is about 280.1796041572.

The spelling of 21994270 in words is "twenty-one million, nine hundred ninety-four thousand, two hundred seventy".