21947702 has 8 divisors (see below), whose sum is σ = 37624656. Its totient is φ = 9406152.

The previous prime is 21947687. The next prime is 21947707. The reversal of 21947702 is 20774912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21947707) 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, 783833 + ... + 783860.

It is an arithmetic number, because the mean of its divisors is an integer number (4703082).

Almost surely, 2^21947702 is an apocalyptic number.

21947702 is a deficient number, since it is larger than the sum of its proper divisors (15676954).

21947702 is a wasteful number, since it uses less digits than its factorization.

21947702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567702.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 21947702 is about 4684.8374571590. The cubic root of 21947702 is about 279.9817249977.

The spelling of 21947702 in words is "twenty-one million, nine hundred forty-seven thousand, seven hundred two".