10001221122187 has 2 divisors, whose sum is σ = 10001221122188. Its totient is φ = 10001221122186.

The previous prime is 10001221122163. The next prime is 10001221122251. The reversal of 10001221122187 is 78122112210001.

10001221122187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (78122112210001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001221122187 is a prime.

It is not a weakly prime, because it can be changed into another prime (10001221122157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000610561093 + 5000610561094.

It is an arithmetic number, because the mean of its divisors is an integer number (5000610561094).

Almost surely, 2^{10001221122187} is an apocalyptic number.

10001221122187 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001221122187 is an equidigital number, since it uses as much as digits as its factorization.

10001221122187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

Adding to 10001221122187 its reverse (78122112210001), we get a palindrome (88123333332188).

The spelling of 10001221122187 in words is "ten trillion, one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred eighty-seven".