21202222087 has 2 divisors, whose sum is σ = 21202222088. Its totient is φ = 21202222086.

The previous prime is 21202222079. The next prime is 21202222099. The reversal of 21202222087 is 78022220212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202222087 - 2³ = 21202222079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202222187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601111043 + 10601111044.

It is an arithmetic number, because the mean of its divisors is an integer number (10601111044).

Almost surely, 2^21202222087 is an apocalyptic number.

21202222087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202222087 is an equidigital number, since it uses as much as digits as its factorization.

21202222087 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 28.

Adding to 21202222087 its reverse (78022220212), we get a palindrome (99224442299).

The spelling of 21202222087 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, eighty-seven".