21223440004 has 12 divisors (see below), whose sum is σ = 39998021644. Its totient is φ = 9795433824.

The previous prime is 21223439971. The next prime is 21223440013. The reversal of 21223440004 is 40004432212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4219801600 + 17003638404 = 64960^2 + 130398^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 204071487 + ... + 204071590.

Almost surely, 2^21223440004 is an apocalyptic number.

It is an amenable number.

21223440004 is a deficient number, since it is larger than the sum of its proper divisors (18774581640).

21223440004 is a wasteful number, since it uses less digits than its factorization.

21223440004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408143094 (or 408143092 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21223440004 its reverse (40004432212), we get a palindrome (61227872216).

The spelling of 21223440004 in words is "twenty-one billion, two hundred twenty-three million, four hundred forty thousand, four".