21331111933 has 2 divisors, whose sum is σ = 21331111934. Its totient is φ = 21331111932.

The previous prime is 21331111931. The next prime is 21331112027. The reversal of 21331111933 is 33911113312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19093159684 + 2237952249 = 138178^2 + 47307^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331111933 - 2¹ = 21331111931 is a prime.

Together with 21331111931, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331111931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665555966 + 10665555967.

It is an arithmetic number, because the mean of its divisors is an integer number (10665555967).

Almost surely, 2^21331111933 is an apocalyptic number.

It is an amenable number.

21331111933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331111933 is an equidigital number, since it uses as much as digits as its factorization.

21331111933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 28.

The spelling of 21331111933 in words is "twenty-one billion, three hundred thirty-one million, one hundred eleven thousand, nine hundred thirty-three".