21220100121191 has 2 divisors, whose sum is σ = 21220100121192. Its totient is φ = 21220100121190.

The previous prime is 21220100121119. The next prime is 21220100121193. The reversal of 21220100121191 is 19112100102212.

It is a happy number.

Together with previous prime (21220100121119) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220100121191 is a prime.

Together with 21220100121193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220100121193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050060595 + 10610050060596.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050060596).

Almost surely, 2^{21220100121191} is an apocalyptic number.

21220100121191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220100121191 is an equidigital number, since it uses as much as digits as its factorization.

21220100121191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 21220100121191 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, one hundred twenty-one thousand, one hundred ninety-one".