21412123 has 2 divisors, whose sum is σ = 21412124. Its totient is φ = 21412122.

The previous prime is 21412099. The next prime is 21412133. The reversal of 21412123 is 32121412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21412123 - 2¹³ = 21403931 is a prime.

It is a super-2 number, since 2×21412123² = 916958022734258, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21412097 and 21412106.

It is not a weakly prime, because it can be changed into another prime (21412133) 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 as a sum of consecutive naturals, namely, 10706061 + 10706062.

It is an arithmetic number, because the mean of its divisors is an integer number (10706062).

Almost surely, 2^21412123 is an apocalyptic number.

21412123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412123 is an equidigital number, since it uses as much as digits as its factorization.

21412123 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21412123 is about 4627.3235244577. The cubic root of 21412123 is about 277.6855259111.

Adding to 21412123 its reverse (32121412), we get a palindrome (53533535).

The spelling of 21412123 in words is "twenty-one million, four hundred twelve thousand, one hundred twenty-three".