21201767 has 2 divisors, whose sum is σ = 21201768. Its totient is φ = 21201766.

The previous prime is 21201757. The next prime is 21201787. The reversal of 21201767 is 76710212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201767 - 2²⁰ = 20153191 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 (21201707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600883 + 10600884.

It is an arithmetic number, because the mean of its divisors is an integer number (10600884).

Almost surely, 2^21201767 is an apocalyptic number.

21201767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201767 is an equidigital number, since it uses as much as digits as its factorization.

21201767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21201767 is about 4604.5376532286. The cubic root of 21201767 is about 276.7731898964.

Adding to 21201767 its reverse (76710212), we get a palindrome (97911979).

The spelling of 21201767 in words is "twenty-one million, two hundred one thousand, seven hundred sixty-seven".