7701202220221 has 16 divisors (see below), whose sum is σ = 7995805038000. Its totient is φ = 7408558660608.

The previous prime is 7701202220203. The next prime is 7701202220249. The reversal of 7701202220221 is 1220222021077.

It can be written as a sum of positive squares in 8 ways, for example, as 36000888121 + 7665201332100 = 189739^2 + 2768610^2 .

It is a cyclic number.

It is not a de Polignac number, because 7701202220221 - 2¹³ = 7701202212029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7701202220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7701202220291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18669205 + ... + 19077253.

It is an arithmetic number, because the mean of its divisors is an integer number (499737814875).

Almost surely, 2^{7701202220221} is an apocalyptic number.

It is an amenable number.

7701202220221 is a deficient number, since it is larger than the sum of its proper divisors (294602817779).

7701202220221 is a wasteful number, since it uses less digits than its factorization.

7701202220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410448.

The product of its (nonzero) digits is 3136, while the sum is 28.

Adding to 7701202220221 its reverse (1220222021077), we get a palindrome (8921424241298).

The spelling of 7701202220221 in words is "seven trillion, seven hundred one billion, two hundred two million, two hundred twenty thousand, two hundred twenty-one".