2091207625921 has 4 divisors (see below), whose sum is σ = 2201271185200. Its totient is φ = 1981144066644.

The previous prime is 2091207625909. The next prime is 2091207625937. The reversal of 2091207625921 is 1295267021902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2091207625921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091207625961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55031779611 + ... + 55031779648.

It is an arithmetic number, because the mean of its divisors is an integer number (550317796300).

Almost surely, 2^{2091207625921} is an apocalyptic number.

It is an amenable number.

2091207625921 is a deficient number, since it is larger than the sum of its proper divisors (110063559279).

2091207625921 is a wasteful number, since it uses less digits than its factorization.

2091207625921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110063559278.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 2091207625921 in words is "two trillion, ninety-one billion, two hundred seven million, six hundred twenty-five thousand, nine hundred twenty-one".