31220013331 has 8 divisors (see below), whose sum is σ = 33623208080. Its totient is φ = 28817055072.

The previous prime is 31220013323. The next prime is 31220013413. The reversal of 31220013331 is 13331002213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31220013331 - 2³ = 31220013323 is a prime.

It is a super-2 number, since 2×31220013331² (a number of 22 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 = 31220013299 and 31220013308.

It is not an unprimeable number, because it can be changed into a prime (31220013731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292600 + ... + 384778.

It is an arithmetic number, because the mean of its divisors is an integer number (4202901010).

Almost surely, 2^31220013331 is an apocalyptic number.

31220013331 is a deficient number, since it is larger than the sum of its proper divisors (2403194749).

31220013331 is a wasteful number, since it uses less digits than its factorization.

31220013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118245.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31220013331 its reverse (13331002213), we get a palindrome (44551015544).

The spelling of 31220013331 in words is "thirty-one billion, two hundred twenty million, thirteen thousand, three hundred thirty-one".