21122122112087 has 2 divisors, whose sum is σ = 21122122112088. Its totient is φ = 21122122112086.

The previous prime is 21122122111939. The next prime is 21122122112131. The reversal of 21122122112087 is 78021122122112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122122112087 is a prime.

It is a super-2 number, since 2×21122122112087² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122122112887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561061056043 + 10561061056044.

It is an arithmetic number, because the mean of its divisors is an integer number (10561061056044).

Almost surely, 2^{21122122112087} is an apocalyptic number.

21122122112087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122122112087 is an equidigital number, since it uses as much as digits as its factorization.

21122122112087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 32.

Adding to 21122122112087 its reverse (78021122122112), we get a palindrome (99143244234199).

The spelling of 21122122112087 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-two million, one hundred twelve thousand, eighty-seven".