21114237 has 4 divisors (see below), whose sum is σ = 28152320. Its totient is φ = 14076156.

The previous prime is 21114229. The next prime is 21114241. The reversal of 21114237 is 73241112.

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 not a de Polignac number, because 21114237 - 2³ = 21114229 is a prime.

It is a super-2 number, since 2×21114237² = 891622008184338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3519037 + ... + 3519042.

It is an arithmetic number, because the mean of its divisors is an integer number (7038080).

Almost surely, 2^21114237 is an apocalyptic number.

It is an amenable number.

21114237 is a deficient number, since it is larger than the sum of its proper divisors (7038083).

21114237 is an equidigital number, since it uses as much as digits as its factorization.

21114237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7038082.

The product of its digits is 336, while the sum is 21.

The square root of 21114237 is about 4595.0230684949. The cubic root of 21114237 is about 276.3917850136.

Adding to 21114237 its reverse (73241112), we get a palindrome (94355349).

The spelling of 21114237 in words is "twenty-one million, one hundred fourteen thousand, two hundred thirty-seven".