7901100020221 has 4 divisors (see below), whose sum is σ = 7971021259452. Its totient is φ = 7831178780992.

The previous prime is 7901100020213. The next prime is 7901100020227. The reversal of 7901100020221 is 1220200011097.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4218961188121 + 3682138832100 = 2054011^2 + 1918890^2 .

It is a cyclic number.

It is not a de Polignac number, because 7901100020221 - 2³ = 7901100020213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7901100020227) 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, 34960619446 + ... + 34960619671.

It is an arithmetic number, because the mean of its divisors is an integer number (1992755314863).

Almost surely, 2^{7901100020221} is an apocalyptic number.

It is an amenable number.

7901100020221 is a deficient number, since it is larger than the sum of its proper divisors (69921239231).

7901100020221 is a wasteful number, since it uses less digits than its factorization.

7901100020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69921239230.

The product of its (nonzero) digits is 504, while the sum is 25.

The spelling of 7901100020221 in words is "seven trillion, nine hundred one billion, one hundred million, twenty thousand, two hundred twenty-one".