21941236 has 12 divisors (see below), whose sum is σ = 38469312. Its totient is φ = 10950008.

The previous prime is 21941233. The next prime is 21941243. The reversal of 21941236 is 63214912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941233) 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, 2620 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (3205776).

Almost surely, 2^21941236 is an apocalyptic number.

It is an amenable number.

21941236 is a deficient number, since it is larger than the sum of its proper divisors (16528076).

21941236 is a wasteful number, since it uses less digits than its factorization.

21941236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310 (or 10308 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 21941236 is about 4684.1473076751. The cubic root of 21941236 is about 279.9542272116.

The spelling of 21941236 in words is "twenty-one million, nine hundred forty-one thousand, two hundred thirty-six".