21122100112171 has 2 divisors, whose sum is σ = 21122100112172. Its totient is φ = 21122100112170.

The previous prime is 21122100112151. The next prime is 21122100112219. The reversal of 21122100112171 is 17121100122112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122100112171 is a prime.

It is a super-2 number, since 2×21122100112171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122100112151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561050056085 + 10561050056086.

It is an arithmetic number, because the mean of its divisors is an integer number (10561050056086).

Almost surely, 2^{21122100112171} is an apocalyptic number.

21122100112171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122100112171 is an equidigital number, since it uses as much as digits as its factorization.

21122100112171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 21122100112171 its reverse (17121100122112), we get a palindrome (38243200234283).

The spelling of 21122100112171 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred million, one hundred twelve thousand, one hundred seventy-one".