21230767 has 2 divisors, whose sum is σ = 21230768. Its totient is φ = 21230766.

The previous prime is 21230761. The next prime is 21230789. The reversal of 21230767 is 76703212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230767 - 2¹⁵ = 21197999 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615383 + 10615384.

It is an arithmetic number, because the mean of its divisors is an integer number (10615384).

Almost surely, 2^21230767 is an apocalyptic number.

21230767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230767 is an equidigital number, since it uses as much as digits as its factorization.

21230767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21230767 is about 4607.6856446594. The cubic root of 21230767 is about 276.8993234987.

Adding to 21230767 its reverse (76703212), we get a palindrome (97933979).

The spelling of 21230767 in words is "twenty-one million, two hundred thirty thousand, seven hundred sixty-seven".