7365638850221 has 2 divisors, whose sum is σ = 7365638850222. Its totient is φ = 7365638850220.

The previous prime is 7365638850191. The next prime is 7365638850233. The reversal of 7365638850221 is 1220588365637.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6388534278025 + 977104572196 = 2527555^2 + 988486^2 .

It is an emirp because it is prime and its reverse (1220588365637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7365638850221 - 2²² = 7365634655917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7365638850421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3682819425110 + 3682819425111.

It is an arithmetic number, because the mean of its divisors is an integer number (3682819425111).

Almost surely, 2^{7365638850221} is an apocalyptic number.

It is an amenable number.

7365638850221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7365638850221 is an equidigital number, since it uses as much as digits as its factorization.

7365638850221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14515200, while the sum is 56.

The spelling of 7365638850221 in words is "seven trillion, three hundred sixty-five billion, six hundred thirty-eight million, eight hundred fifty thousand, two hundred twenty-one".