21234011 has 2 divisors, whose sum is σ = 21234012. Its totient is φ = 21234010.

The previous prime is 21234007. The next prime is 21234013. The reversal of 21234011 is 11043212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21234011 - 2² = 21234007 is a prime.

Together with 21234013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21234013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617005 + 10617006.

It is an arithmetic number, because the mean of its divisors is an integer number (10617006).

Almost surely, 2^21234011 is an apocalyptic number.

21234011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234011 is an equidigital number, since it uses as much as digits as its factorization.

21234011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21234011 is about 4608.0376517559. The cubic root of 21234011 is about 276.9134259200.

Adding to 21234011 its reverse (11043212), we get a palindrome (32277223).

The spelling of 21234011 in words is "twenty-one million, two hundred thirty-four thousand, eleven".