233221220309 has 12 divisors (see below), whose sum is σ = 295961623488. Its totient is φ = 181730820600.

The previous prime is 233221220303. The next prime is 233221220377. The reversal of 233221220309 is 903022122332.

It is a happy number.

It is not a de Polignac number, because 233221220309 - 2²⁰ = 233220171733 is a prime.

It is a super-2 number, since 2×233221220309² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233221220303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216345677 + ... + 216346754.

It is an arithmetic number, because the mean of its divisors is an integer number (24663468624).

Almost surely, 2^233221220309 is an apocalyptic number.

It is an amenable number.

233221220309 is a deficient number, since it is larger than the sum of its proper divisors (62740403179).

233221220309 is a wasteful number, since it uses less digits than its factorization.

233221220309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432692456 (or 432692449 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The spelling of 233221220309 in words is "two hundred thirty-three billion, two hundred twenty-one million, two hundred twenty thousand, three hundred nine".