7563941221 has 2 divisors, whose sum is σ = 7563941222. Its totient is φ = 7563941220.

The previous prime is 7563941159. The next prime is 7563941233. The reversal of 7563941221 is 1221493657.

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., 4354152196 + 3209789025 = 65986^2 + 56655^2 .

It is a cyclic number.

It is not a de Polignac number, because 7563941221 - 2¹⁵ = 7563908453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7563941251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3781970610 + 3781970611.

It is an arithmetic number, because the mean of its divisors is an integer number (3781970611).

Almost surely, 2^7563941221 is an apocalyptic number.

It is an amenable number.

7563941221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7563941221 is an equidigital number, since it uses as much as digits as its factorization.

7563941221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 7563941221 is about 86970.9216980020. The cubic root of 7563941221 is about 1962.9807849379.

The spelling of 7563941221 in words is "seven billion, five hundred sixty-three million, nine hundred forty-one thousand, two hundred twenty-one".