33013213220 has 48 divisors (see below), whose sum is σ = 75499588080. Its totient is φ = 12052525056.

The previous prime is 33013213193. The next prime is 33013213229. The reversal of 33013213220 is 2231231033.

It can be written as a sum of positive squares in 8 ways, for example, as 17320139236 + 15693073984 = 131606^2 + 125272^2 .

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 = 33013213192 and 33013213201.

It is not an unprimeable number, because it can be changed into a prime (33013213229) 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, 690197 + ... + 736476.

It is an arithmetic number, because the mean of its divisors is an integer number (1572908085).

Almost surely, 2^33013213220 is an apocalyptic number.

It is an amenable number.

33013213220 is an abundant number, since it is smaller than the sum of its proper divisors (42486374860).

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

33013213220 is a wasteful number, since it uses less digits than its factorization.

33013213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426784 (or 1426782 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 33013213220 its reverse (2231231033), we get a palindrome (35244444253).

The spelling of 33013213220 in words is "thirty-three billion, thirteen million, two hundred thirteen thousand, two hundred twenty".