7221971633 has 2 divisors, whose sum is σ = 7221971634. Its totient is φ = 7221971632.

The previous prime is 7221971621. The next prime is 7221971639. The reversal of 7221971633 is 3361791227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7139743009 + 82228624 = 84497^2 + 9068^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221971633 - 2⁸ = 7221971377 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221971639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610985816 + 3610985817.

It is an arithmetic number, because the mean of its divisors is an integer number (3610985817).

Almost surely, 2^7221971633 is an apocalyptic number.

It is an amenable number.

7221971633 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221971633 is an equidigital number, since it uses as much as digits as its factorization.

7221971633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 7221971633 is about 84982.1842093977. The cubic root of 7221971633 is about 1932.9409763013.

The spelling of 7221971633 in words is "seven billion, two hundred twenty-one million, nine hundred seventy-one thousand, six hundred thirty-three".