21112012222087 has 2 divisors, whose sum is σ = 21112012222088. Its totient is φ = 21112012222086.

The previous prime is 21112012222031. The next prime is 21112012222123. The reversal of 21112012222087 is 78022221021112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112012222087 - 2¹⁵ = 21112012189319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112012223087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556006111043 + 10556006111044.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006111044).

Almost surely, 2^{21112012222087} is an apocalyptic number.

21112012222087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012222087 is an equidigital number, since it uses as much as digits as its factorization.

21112012222087 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 31.

Adding to 21112012222087 its reverse (78022221021112), we get a palindrome (99134233243199).

The spelling of 21112012222087 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-two thousand, eighty-seven".