31221344133 has 40 divisors (see below), whose sum is σ = 53327569152. Its totient is φ = 17832226464.

The previous prime is 31221344029. The next prime is 31221344173. The reversal of 31221344133 is 33144312213.

It is a happy number.

31221344133 is a `hidden beast` number, since 3 + 1 + 2 + 213 + 441 + 3 + 3 = 666.

It is not a de Polignac number, because 31221344133 - 2¹⁴ = 31221327749 is a prime.

It is a super-3 number, since 3×31221344133³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31221344097 and 31221344106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221344173) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1284691 + ... + 1308767.

Almost surely, 2^31221344133 is an apocalyptic number.

It is an amenable number.

31221344133 is a deficient number, since it is larger than the sum of its proper divisors (22106225019).

31221344133 is a wasteful number, since it uses less digits than its factorization.

31221344133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26383 (or 26374 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 31221344133 its reverse (33144312213), we get a palindrome (64365656346).

The spelling of 31221344133 in words is "thirty-one billion, two hundred twenty-one million, three hundred forty-four thousand, one hundred thirty-three".