21233011 has 2 divisors, whose sum is σ = 21233012. Its totient is φ = 21233010.

The previous prime is 21232993. The next prime is 21233027. The reversal of 21233011 is 11033212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21233011 - 2²¹ = 19135859 is a prime.

It is a super-2 number, since 2×21233011² = 901681512252242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21232982 and 21233000.

It is not a weakly prime, because it can be changed into another prime (21233081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616505 + 10616506.

It is an arithmetic number, because the mean of its divisors is an integer number (10616506).

Almost surely, 2^21233011 is an apocalyptic number.

21233011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233011 is an equidigital number, since it uses as much as digits as its factorization.

21233011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21233011 is about 4607.9291444205. The cubic root of 21233011 is about 276.9090788409.

Adding to 21233011 its reverse (11033212), we get a palindrome (32266223).

The spelling of 21233011 in words is "twenty-one million, two hundred thirty-three thousand, eleven".