21947182 has 4 divisors (see below), whose sum is σ = 32920776. Its totient is φ = 10973590.

The previous prime is 21947173. The next prime is 21947197. The reversal of 21947182 is 28174912.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21947182² = 963357595482248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5486794 + ... + 5486797.

It is an arithmetic number, because the mean of its divisors is an integer number (8230194).

Almost surely, 2^21947182 is an apocalyptic number.

21947182 is a deficient number, since it is larger than the sum of its proper divisors (10973594).

21947182 is a wasteful number, since it uses less digits than its factorization.

21947182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10973593.

The product of its digits is 8064, while the sum is 34.

The square root of 21947182 is about 4684.7819586401. The cubic root of 21947182 is about 279.9795138073.

The spelling of 21947182 in words is "twenty-one million, nine hundred forty-seven thousand, one hundred eighty-two".