21999014 has 4 divisors (see below), whose sum is σ = 32998524. Its totient is φ = 10999506.

The previous prime is 21999013. The next prime is 21999041. The reversal of 21999014 is 41099912.

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 (21999013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5499752 + ... + 5499755.

It is an arithmetic number, because the mean of its divisors is an integer number (8249631).

Almost surely, 2^21999014 is an apocalyptic number.

21999014 is a deficient number, since it is larger than the sum of its proper divisors (10999510).

21999014 is a wasteful number, since it uses less digits than its factorization.

21999014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10999509.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 21999014 is about 4690.3106506926. The cubic root of 21999014 is about 280.1997469261.

The spelling of 21999014 in words is "twenty-one million, nine hundred ninety-nine thousand, fourteen".