221121073633 has 2 divisors, whose sum is σ = 221121073634. Its totient is φ = 221121073632.

The previous prime is 221121073631. The next prime is 221121073651. The reversal of 221121073633 is 336370121122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149836345569 + 71284728064 = 387087^2 + 266992^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121073633 - 2¹ = 221121073631 is a prime.

It is a super-2 number, since 2×221121073633² (a number of 23 digits) contains 22 as substring.

Together with 221121073631, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 221121073595 and 221121073604.

It is not a weakly prime, because it can be changed into another prime (221121073631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560536816 + 110560536817.

It is an arithmetic number, because the mean of its divisors is an integer number (110560536817).

Almost surely, 2^221121073633 is an apocalyptic number.

It is an amenable number.

221121073633 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121073633 is an equidigital number, since it uses as much as digits as its factorization.

221121073633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 221121073633 its reverse (336370121122), we get a palindrome (557491194755).

The spelling of 221121073633 in words is "two hundred twenty-one billion, one hundred twenty-one million, seventy-three thousand, six hundred thirty-three".