2121244653091 has 4 divisors (see below), whose sum is σ = 2121250118400. Its totient is φ = 2121239187784.

The previous prime is 2121244653071. The next prime is 2121244653107. The reversal of 2121244653091 is 1903564421212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121244653091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121244653041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101936 + ... + 2942893.

It is an arithmetic number, because the mean of its divisors is an integer number (530312529600).

Almost surely, 2^{2121244653091} is an apocalyptic number.

2121244653091 is a deficient number, since it is larger than the sum of its proper divisors (5465309).

2121244653091 is an equidigital number, since it uses as much as digits as its factorization.

2121244653091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465308.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 2121244653091 in words is "two trillion, one hundred twenty-one billion, two hundred forty-four million, six hundred fifty-three thousand, ninety-one".