21947354 has 24 divisors (see below), whose sum is σ = 38895552. Its totient is φ = 9207120.

The previous prime is 21947339. The next prime is 21947363. The reversal of 21947354 is 45374912.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 767 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (1620648).

Almost surely, 2^21947354 is an apocalyptic number.

21947354 is a deficient number, since it is larger than the sum of its proper divisors (16948198).

21947354 is a wasteful number, since it uses less digits than its factorization.

21947354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942 (or 5929 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 21947354 is about 4684.8003159153. The cubic root of 21947354 is about 279.9802452049.

The spelling of 21947354 in words is "twenty-one million, nine hundred forty-seven thousand, three hundred fifty-four".