33231211220 has 12 divisors (see below), whose sum is σ = 69785543604. Its totient is φ = 13292484480.

The previous prime is 33231211201. The next prime is 33231211243. The reversal of 33231211220 is 2211213233.

It can be written as a sum of positive squares in 2 ways, for example, as 3964213444 + 29266997776 = 62962^2 + 171076^2 .

It is a super-2 number, since 2×33231211220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1661560561 = 33231211220 / (3 + 3 + 2 + 3 + 1 + 2 + 1 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 33231211192 and 33231211201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830780261 + ... + 830780300.

It is an arithmetic number, because the mean of its divisors is an integer number (5815461967).

Almost surely, 2^33231211220 is an apocalyptic number.

It is an amenable number.

33231211220 is an abundant number, since it is smaller than the sum of its proper divisors (36554332384).

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

33231211220 is a wasteful number, since it uses less digits than its factorization.

33231211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661560570 (or 1661560568 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 33231211220 its reverse (2211213233), we get a palindrome (35442424453).

The spelling of 33231211220 in words is "thirty-three billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty".