21996614 has 4 divisors (see below), whose sum is σ = 32994924. Its totient is φ = 10998306.

The previous prime is 21996613. The next prime is 21996629. The reversal of 21996614 is 41669912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5499152 + ... + 5499155.

It is an arithmetic number, because the mean of its divisors is an integer number (8248731).

Almost surely, 2^21996614 is an apocalyptic number.

21996614 is a deficient number, since it is larger than the sum of its proper divisors (10998310).

21996614 is a wasteful number, since it uses less digits than its factorization.

21996614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10998309.

The product of its digits is 23328, while the sum is 38.

The square root of 21996614 is about 4690.0547971212. The cubic root of 21996614 is about 280.1895570171.

The spelling of 21996614 in words is "twenty-one million, nine hundred ninety-six thousand, six hundred fourteen".