21241123 has 2 divisors, whose sum is σ = 21241124. Its totient is φ = 21241122.

The previous prime is 21241093. The next prime is 21241147. The reversal of 21241123 is 32114212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21241123 - 2⁵ = 21241091 is a prime.

It is a super-2 number, since 2×21241123² = 902370612602258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21241097 and 21241106.

It is not a weakly prime, because it can be changed into another prime (21241153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620561 + 10620562.

It is an arithmetic number, because the mean of its divisors is an integer number (10620562).

Almost surely, 2^21241123 is an apocalyptic number.

21241123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241123 is an equidigital number, since it uses as much as digits as its factorization.

21241123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 21241123 is about 4608.8092822333. The cubic root of 21241123 is about 276.9443384099.

Adding to 21241123 its reverse (32114212), we get a palindrome (53355335).

The spelling of 21241123 in words is "twenty-one million, two hundred forty-one thousand, one hundred twenty-three".