21200791 has 2 divisors, whose sum is σ = 21200792. Its totient is φ = 21200790.

The previous prime is 21200783. The next prime is 21200801. The reversal of 21200791 is 19700212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200791 - 2³ = 21200783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600395 + 10600396.

It is an arithmetic number, because the mean of its divisors is an integer number (10600396).

Almost surely, 2^21200791 is an apocalyptic number.

21200791 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200791 is an equidigital number, since it uses as much as digits as its factorization.

21200791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21200791 is about 4604.4316695983. The cubic root of 21200791 is about 276.7689428482.

The spelling of 21200791 in words is "twenty-one million, two hundred thousand, seven hundred ninety-one".