21123033011 has 2 divisors, whose sum is σ = 21123033012. Its totient is φ = 21123033010.

The previous prime is 21123032999. The next prime is 21123033017. The reversal of 21123033011 is 11033032112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21123033011 is a prime.

It is a super-2 number, since 2×21123033011² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21123033017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561516505 + 10561516506.

It is an arithmetic number, because the mean of its divisors is an integer number (10561516506).

Almost surely, 2^21123033011 is an apocalyptic number.

21123033011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123033011 is an equidigital number, since it uses as much as digits as its factorization.

21123033011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21123033011 its reverse (11033032112), we get a palindrome (32156065123).

The spelling of 21123033011 in words is "twenty-one billion, one hundred twenty-three million, thirty-three thousand, eleven".