221131433 has 2 divisors, whose sum is σ = 221131434. Its totient is φ = 221131432.

The previous prime is 221131429. The next prime is 221131441. The reversal of 221131433 is 334131122.

221131433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197346304 + 23785129 = 14048^2 + 4877^2 .

It is a cyclic number.

It is not a de Polignac number, because 221131433 - 2² = 221131429 is a prime.

It is a super-2 number, since 2×221131433² = 97798221321266978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221131403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110565716 + 110565717.

It is an arithmetic number, because the mean of its divisors is an integer number (110565717).

Almost surely, 2^221131433 is an apocalyptic number.

It is an amenable number.

221131433 is a deficient number, since it is larger than the sum of its proper divisors (1).

221131433 is an equidigital number, since it uses as much as digits as its factorization.

221131433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 20.

The square root of 221131433 is about 14870.4886604308. The cubic root of 221131433 is about 604.7141905255.

Adding to 221131433 its reverse (334131122), we get a palindrome (555262555).

The spelling of 221131433 in words is "two hundred twenty-one million, one hundred thirty-one thousand, four hundred thirty-three".