221031321330 has 32 divisors (see below), whose sum is σ = 530555313600. Its totient is φ = 58932780992.

The previous prime is 221031321323. The next prime is 221031321347. The reversal of 221031321330 is 33123130122.

It is a junction number, because it is equal to n+sod(n) for n = 221031321297 and 221031321306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353445 + ... + 752984.

It is an arithmetic number, because the mean of its divisors is an integer number (16579853550).

Almost surely, 2^221031321330 is an apocalyptic number.

221031321330 is an abundant number, since it is smaller than the sum of its proper divisors (309523992270).

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

221031321330 is a wasteful number, since it uses less digits than its factorization.

221031321330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113098.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 221031321330 its reverse (33123130122), we get a palindrome (254154451452).

It can be divided in two parts, 221031 and 321330, that added together give a triangular number (542361 = T₁₀₄₁).

The spelling of 221031321330 in words is "two hundred twenty-one billion, thirty-one million, three hundred twenty-one thousand, three hundred thirty".