33231312220 has 24 divisors (see below), whose sum is σ = 70968567600. Its totient is φ = 13067227392.

The previous prime is 33231312211. The next prime is 33231312253. The reversal of 33231312220 is 2221313233.

It is a super-2 number, since 2×33231312220² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33231312191 and 33231312200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14079885 + ... + 14082244.

It is an arithmetic number, because the mean of its divisors is an integer number (2957023650).

Almost surely, 2^33231312220 is an apocalyptic number.

It is an amenable number.

33231312220 is an abundant number, since it is smaller than the sum of its proper divisors (37737255380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33231312220 is a wasteful number, since it uses less digits than its factorization.

33231312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28162197 (or 28162195 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 33231312220 its reverse (2221313233), we get a palindrome (35452625453).

The spelling of 33231312220 in words is "thirty-three billion, two hundred thirty-one million, three hundred twelve thousand, two hundred twenty".