2121211281757 has 32 divisors (see below), whose sum is σ = 2308438103040. Its totient is φ = 1941506058240.

The previous prime is 2121211281727. The next prime is 2121211281781. The reversal of 2121211281757 is 7571821121212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2121211281757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121211281727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80589163 + ... + 80615479.

It is an arithmetic number, because the mean of its divisors is an integer number (72138690720).

Almost surely, 2^{2121211281757} is an apocalyptic number.

It is an amenable number.

2121211281757 is a deficient number, since it is larger than the sum of its proper divisors (187226821283).

2121211281757 is a wasteful number, since it uses less digits than its factorization.

2121211281757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27021.

The product of its digits is 31360, while the sum is 40.

The spelling of 2121211281757 in words is "two trillion, one hundred twenty-one billion, two hundred eleven million, two hundred eighty-one thousand, seven hundred fifty-seven".