21939194 has 16 divisors (see below), whose sum is σ = 34499520. Its totient is φ = 10443840.

The previous prime is 21939179. The next prime is 21939233. The reversal of 21939194 is 49193912.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10097 + ... + 12075.

It is an arithmetic number, because the mean of its divisors is an integer number (2156220).

Almost surely, 2^21939194 is an apocalyptic number.

21939194 is a deficient number, since it is larger than the sum of its proper divisors (12560326).

21939194 is a wasteful number, since it uses less digits than its factorization.

21939194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245.

The product of its digits is 17496, while the sum is 38.

The square root of 21939194 is about 4683.9293333696. The cubic root of 21939194 is about 279.9455421301.

The spelling of 21939194 in words is "twenty-one million, nine hundred thirty-nine thousand, one hundred ninety-four".