21101933 has 2 divisors, whose sum is σ = 21101934. Its totient is φ = 21101932.

The previous prime is 21101923. The next prime is 21101963. The reversal of 21101933 is 33910112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17330569 + 3771364 = 4163^2 + 1942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101933 - 2⁶ = 21101869 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550966 + 10550967.

It is an arithmetic number, because the mean of its divisors is an integer number (10550967).

Almost surely, 2^21101933 is an apocalyptic number.

It is an amenable number.

21101933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101933 is an equidigital number, since it uses as much as digits as its factorization.

21101933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 21101933 is about 4593.6840335400. The cubic root of 21101933 is about 276.3380868808.

The spelling of 21101933 in words is "twenty-one million, one hundred one thousand, nine hundred thirty-three".