21939614 has 4 divisors (see below), whose sum is σ = 32909424. Its totient is φ = 10969806.

The previous prime is 21939607. The next prime is 21939641. The reversal of 21939614 is 41693912.

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

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, 5484902 + ... + 5484905.

It is an arithmetic number, because the mean of its divisors is an integer number (8227356).

Almost surely, 2^21939614 is an apocalyptic number.

21939614 is a deficient number, since it is larger than the sum of its proper divisors (10969810).

21939614 is a wasteful number, since it uses less digits than its factorization.

21939614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10969809.

The product of its digits is 11664, while the sum is 35.

The square root of 21939614 is about 4683.9741673071. The cubic root of 21939614 is about 279.9473285278.

The spelling of 21939614 in words is "twenty-one million, nine hundred thirty-nine thousand, six hundred fourteen".