221024004 has 24 divisors (see below), whose sum is σ = 546059808. Its totient is φ = 69340800.

The previous prime is 221024003. The next prime is 221024029. The reversal of 221024004 is 400420122.

221024004 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221024004² = 97703220688384032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221024003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541522 + ... + 541929.

It is an arithmetic number, because the mean of its divisors is an integer number (22752492).

Almost surely, 2^221024004 is an apocalyptic number.

It is an amenable number.

221024004 is an abundant number, since it is smaller than the sum of its proper divisors (325035804).

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

221024004 is a wasteful number, since it uses less digits than its factorization.

221024004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083475 (or 1083473 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 221024004 is about 14866.8760672846. The cubic root of 221024004 is about 604.6162482251.

Adding to 221024004 its reverse (400420122), we get a palindrome (621444126).

It can be divided in two parts, 22102 and 4004, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 221024004 in words is "two hundred twenty-one million, twenty-four thousand, four".