31221140441233 has 4 divisors (see below), whose sum is σ = 31497433719588. Its totient is φ = 30944847162880.

The previous prime is 31221140441209. The next prime is 31221140441287. The reversal of 31221140441233 is 33214404112213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3891592634944 + 27329547806289 = 1972712^2 + 5227767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31221140441233 is a prime.

It is a super-2 number, since 2×31221140441233² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31221140441195 and 31221140441204.

It is not an unprimeable number, because it can be changed into a prime (31221140471233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138146639008 + ... + 138146639233.

It is an arithmetic number, because the mean of its divisors is an integer number (7874358429897).

Almost surely, 2^{31221140441233} is an apocalyptic number.

It is an amenable number.

31221140441233 is a deficient number, since it is larger than the sum of its proper divisors (276293278355).

31221140441233 is a wasteful number, since it uses less digits than its factorization.

31221140441233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276293278354.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 31221140441233 its reverse (33214404112213), we get a palindrome (64435544553446).

The spelling of 31221140441233 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred forty million, four hundred forty-one thousand, two hundred thirty-three".