221022032004 has 72 divisors (see below), whose sum is σ = 563604769728. Its totient is φ = 73027805760.

The previous prime is 221022032003. The next prime is 221022032129. The reversal of 221022032004 is 400230220122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221022032003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4156674 + ... + 4209510.

It is an arithmetic number, because the mean of its divisors is an integer number (7827844024).

Almost surely, 2^221022032004 is an apocalyptic number.

It is an amenable number.

221022032004 is an abundant number, since it is smaller than the sum of its proper divisors (342582737724).

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

221022032004 is a wasteful number, since it uses less digits than its factorization.

221022032004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53865 (or 53860 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 221022032004 its reverse (400230220122), we get a palindrome (621252252126).

The spelling of 221022032004 in words is "two hundred twenty-one billion, twenty-two million, thirty-two thousand, four".