21404042204 has 6 divisors (see below), whose sum is σ = 37457073864. Its totient is φ = 10702021100.

The previous prime is 21404042171. The next prime is 21404042207. The reversal of 21404042204 is 40224040412.

It is a super-2 number, since 2×21404042204² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21404042204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404042207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675505272 + ... + 2675505279.

It is an arithmetic number, because the mean of its divisors is an integer number (6242845644).

Almost surely, 2^21404042204 is an apocalyptic number.

It is an amenable number.

21404042204 is a deficient number, since it is larger than the sum of its proper divisors (16053031660).

21404042204 is a wasteful number, since it uses less digits than its factorization.

21404042204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351010555 (or 5351010553 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21404042204 its reverse (40224040412), we get a palindrome (61628082616).

The spelling of 21404042204 in words is "twenty-one billion, four hundred four million, forty-two thousand, two hundred four".