221021432004 has 96 divisors (see below), whose sum is σ = 529199379072. Its totient is φ = 71774208000.

The previous prime is 221021431997. The next prime is 221021432011. The reversal of 221021432004 is 400234120122.

It is an interprime number because it is at equal distance from previous prime (221021431997) and next prime (221021432011).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34047199 + ... + 34053689.

It is an arithmetic number, because the mean of its divisors is an integer number (5512493532).

Almost surely, 2^221021432004 is an apocalyptic number.

It is an amenable number.

221021432004 is an abundant number, since it is smaller than the sum of its proper divisors (308177947068).

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

221021432004 is a wasteful number, since it uses less digits than its factorization.

221021432004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997 (or 6995 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 221021432004 its reverse (400234120122), we get a palindrome (621255552126).

The spelling of 221021432004 in words is "two hundred twenty-one billion, twenty-one million, four hundred thirty-two thousand, four".