33112312220 has 48 divisors (see below), whose sum is σ = 74899590528. Its totient is φ = 12223664640.

The previous prime is 33112312217. The next prime is 33112312223. The reversal of 33112312220 is 2221321133.

It is an interprime number because it is at equal distance from previous prime (33112312217) and next prime (33112312223).

It is a super-2 number, since 2×33112312220² (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).

It is a junction number, because it is equal to n+sod(n) for n = 33112312192 and 33112312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33112312223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1808552 + ... + 1826768.

It is an arithmetic number, because the mean of its divisors is an integer number (1560408136).

Almost surely, 2^33112312220 is an apocalyptic number.

It is an amenable number.

33112312220 is an abundant number, since it is smaller than the sum of its proper divisors (41787278308).

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

33112312220 is a wasteful number, since it uses less digits than its factorization.

33112312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25230 (or 25228 counting only the distinct ones).

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

Adding to 33112312220 its reverse (2221321133), we get a palindrome (35333633353).

It can be divided in two parts, 331123 and 12220, that added together give a palindrome (343343).

The spelling of 33112312220 in words is "thirty-three billion, one hundred twelve million, three hundred twelve thousand, two hundred twenty".