133221031 has 2 divisors, whose sum is σ = 133221032. Its totient is φ = 133221030.

The previous prime is 133221029. The next prime is 133221047. The reversal of 133221031 is 130122331.

It is an a-pointer prime, because the next prime (133221047) can be obtained adding 133221031 to its sum of digits (16).

It is a weak prime.

It is an emirp because it is prime and its reverse (130122331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133221031 - 2¹ = 133221029 is a prime.

It is a super-2 number, since 2×133221031² = 35495686201405922, which contains 22 as substring.

Together with 133221029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 133220996 and 133221014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133221091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66610515 + 66610516.

It is an arithmetic number, because the mean of its divisors is an integer number (66610516).

Almost surely, 2^133221031 is an apocalyptic number.

133221031 is a deficient number, since it is larger than the sum of its proper divisors (1).

133221031 is an equidigital number, since it uses as much as digits as its factorization.

133221031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 133221031 is about 11542.1415257308. The cubic root of 133221031 is about 510.7294840790.

Adding to 133221031 its reverse (130122331), we get a palindrome (263343362).

The spelling of 133221031 in words is "one hundred thirty-three million, two hundred twenty-one thousand, thirty-one".