221521225843 has 2 divisors, whose sum is σ = 221521225844. Its totient is φ = 221521225842.

The previous prime is 221521225829. The next prime is 221521225901. The reversal of 221521225843 is 348522125122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221521225843 - 2²⁹ = 220984354931 is a prime.

It is a super-2 number, since 2×221521225843² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221521225813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110760612921 + 110760612922.

It is an arithmetic number, because the mean of its divisors is an integer number (110760612922).

Almost surely, 2^221521225843 is an apocalyptic number.

221521225843 is a deficient number, since it is larger than the sum of its proper divisors (1).

221521225843 is an equidigital number, since it uses as much as digits as its factorization.

221521225843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76800, while the sum is 37.

The spelling of 221521225843 in words is "two hundred twenty-one billion, five hundred twenty-one million, two hundred twenty-five thousand, eight hundred forty-three".