21114243 has 8 divisors (see below), whose sum is σ = 31280400. Its totient is φ = 14076144.

The previous prime is 21114241. The next prime is 21114257. The reversal of 21114243 is 34241112.

It is not a de Polignac number, because 21114243 - 2¹ = 21114241 is a prime.

It is a super-2 number, since 2×21114243² = 891622514926098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21114241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390978 + ... + 391031.

It is an arithmetic number, because the mean of its divisors is an integer number (3910050).

Almost surely, 2^21114243 is an apocalyptic number.

21114243 is a deficient number, since it is larger than the sum of its proper divisors (10166157).

21114243 is an equidigital number, since it uses as much as digits as its factorization.

21114243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782018 (or 782012 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21114243 is about 4595.0237213751. The cubic root of 21114243 is about 276.3918111942.

Adding to 21114243 its reverse (34241112), we get a palindrome (55355355).

The spelling of 21114243 in words is "twenty-one million, one hundred fourteen thousand, two hundred forty-three".