20212221187 has 2 divisors, whose sum is σ = 20212221188. Its totient is φ = 20212221186.

The previous prime is 20212221143. The next prime is 20212221199. The reversal of 20212221187 is 78112221202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20212221187 - 2¹⁵ = 20212188419 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212221137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106110593 + 10106110594.

It is an arithmetic number, because the mean of its divisors is an integer number (10106110594).

Almost surely, 2^20212221187 is an apocalyptic number.

20212221187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212221187 is an equidigital number, since it uses as much as digits as its factorization.

20212221187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 20212221187 its reverse (78112221202), we get a palindrome (98324442389).

The spelling of 20212221187 in words is "twenty billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eighty-seven".