21222212087 has 2 divisors, whose sum is σ = 21222212088. Its totient is φ = 21222212086.

The previous prime is 21222212059. The next prime is 21222212111. The reversal of 21222212087 is 78021222212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222212087 - 2⁸ = 21222211831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222212047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611106043 + 10611106044.

It is an arithmetic number, because the mean of its divisors is an integer number (10611106044).

Almost surely, 2^21222212087 is an apocalyptic number.

21222212087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222212087 is an equidigital number, since it uses as much as digits as its factorization.

21222212087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 29.

Adding to 21222212087 its reverse (78021222212), we get a palindrome (99243434299).

The spelling of 21222212087 in words is "twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, eighty-seven".