21414993 has 4 divisors (see below), whose sum is σ = 28553328. Its totient is φ = 14276660.

The previous prime is 21414983. The next prime is 21415027. The reversal of 21414993 is 39941412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21414993 - 2⁵ = 21414961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21414923) 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, 3569163 + ... + 3569168.

It is an arithmetic number, because the mean of its divisors is an integer number (7138332).

Almost surely, 2^21414993 is an apocalyptic number.

It is an amenable number.

21414993 is a deficient number, since it is larger than the sum of its proper divisors (7138335).

21414993 is an equidigital number, since it uses as much as digits as its factorization.

21414993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138334.

The product of its digits is 7776, while the sum is 33.

The square root of 21414993 is about 4627.6336285406. The cubic root of 21414993 is about 277.6979319961.

The spelling of 21414993 in words is "twenty-one million, four hundred fourteen thousand, nine hundred ninety-three".