3531221320 has 32 divisors (see below), whose sum is σ = 8667544320. Its totient is φ = 1284080320.

The previous prime is 3531221299. The next prime is 3531221333. The reversal of 3531221320 is 231221353.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 3531221291 and 3531221300.

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, 4012312 + ... + 4013191.

It is an arithmetic number, because the mean of its divisors is an integer number (270860760).

Almost surely, 2^3531221320 is an apocalyptic number.

It is an amenable number.

3531221320 is an abundant number, since it is smaller than the sum of its proper divisors (5136323000).

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

3531221320 is a wasteful number, since it uses less digits than its factorization.

3531221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8025525 (or 8025521 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 3531221320 is about 59424.0803041999. The cubic root of 3531221320 is about 1522.7957146088.

Adding to 3531221320 its reverse (231221353), we get a palindrome (3762442673).

The spelling of 3531221320 in words is "three billion, five hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty".