2100001221193 has 2 divisors, whose sum is σ = 2100001221194. Its totient is φ = 2100001221192.

The previous prime is 2100001221191. The next prime is 2100001221271. The reversal of 2100001221193 is 3911221000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1889863326729 + 210137894464 = 1374723^2 + 458408^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100001221193 - 2¹ = 2100001221191 is a prime.

Together with 2100001221191, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2100001221191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050000610596 + 1050000610597.

It is an arithmetic number, because the mean of its divisors is an integer number (1050000610597).

Almost surely, 2^{2100001221193} is an apocalyptic number.

It is an amenable number.

2100001221193 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100001221193 is an equidigital number, since it uses as much as digits as its factorization.

2100001221193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 2100001221193 in words is "two trillion, one hundred billion, one million, two hundred twenty-one thousand, one hundred ninety-three".