21114091 has 4 divisors (see below), whose sum is σ = 21141000. Its totient is φ = 21087184.

The previous prime is 21114089. The next prime is 21114097. The reversal of 21114091 is 19041112.

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

It is a cyclic number.

It is not a de Polignac number, because 21114091 - 2¹ = 21114089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21114097) 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, 12241 + ... + 13858.

It is an arithmetic number, because the mean of its divisors is an integer number (5285250).

Almost surely, 2^21114091 is an apocalyptic number.

21114091 is a deficient number, since it is larger than the sum of its proper divisors (26909).

21114091 is an equidigital number, since it uses as much as digits as its factorization.

21114091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26908.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 21114091 is about 4595.0071817136. The cubic root of 21114091 is about 276.3911479507.

The spelling of 21114091 in words is "twenty-one million, one hundred fourteen thousand, ninety-one".