2121201220194 has 24 divisors (see below), whose sum is σ = 5252498259840. Its totient is φ = 606057491448.

The previous prime is 2121201220163. The next prime is 2121201220199. The reversal of 2121201220194 is 4910221021212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2121201220199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8417465034 + ... + 8417465285.

It is an arithmetic number, because the mean of its divisors is an integer number (218854094160).

Almost surely, 2^{2121201220194} is an apocalyptic number.

2121201220194 is an abundant number, since it is smaller than the sum of its proper divisors (3131297039646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121201220194 is a wasteful number, since it uses less digits than its factorization.

2121201220194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16834930334 (or 16834930331 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 2121201220194 in words is "two trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty thousand, one hundred ninety-four".