2091212121242 has 8 divisors (see below), whose sum is σ = 3188241430932. Its totient is φ = 1028464977600.

The previous prime is 2091212121241. The next prime is 2091212121253. The reversal of 2091212121242 is 2421212121902.

It can be written as a sum of positive squares in 2 ways, for example, as 2084728811881 + 6483309361 = 1443859^2 + 80519^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2091212121241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8570541359 + ... + 8570541602.

Almost surely, 2^{2091212121242} is an apocalyptic number.

2091212121242 is a deficient number, since it is larger than the sum of its proper divisors (1097029309690).

2091212121242 is a wasteful number, since it uses less digits than its factorization.

2091212121242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17141083024.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 2091212121242 in words is "two trillion, ninety-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred forty-two".