21947950 has 24 divisors (see below), whose sum is σ = 41088888. Its totient is φ = 8722080.

The previous prime is 21947923. The next prime is 21947951. The reversal of 21947950 is 5974912.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21947951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6804 + ... + 9496.

It is an arithmetic number, because the mean of its divisors is an integer number (1712037).

Almost surely, 2^21947950 is an apocalyptic number.

21947950 is a deficient number, since it is larger than the sum of its proper divisors (19140938).

21947950 is a wasteful number, since it uses less digits than its factorization.

21947950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868 (or 2863 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 21947950 is about 4684.8639254518. The cubic root of 21947950 is about 279.9827795532.

The spelling of 21947950 in words is "twenty-one million, nine hundred forty-seven thousand, nine hundred fifty".