21404342004 has 48 divisors (see below), whose sum is σ = 53690649600. Its totient is φ = 6615448416.

The previous prime is 21404341999. The next prime is 21404342021. The reversal of 21404342004 is 40024340412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987994 + ... + 1009425.

It is an arithmetic number, because the mean of its divisors is an integer number (1118555200).

Almost surely, 2^21404342004 is an apocalyptic number.

It is an amenable number.

21404342004 is an abundant number, since it is smaller than the sum of its proper divisors (32286307596).

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

21404342004 is a wasteful number, since it uses less digits than its factorization.

21404342004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997492 (or 1997490 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21404342004 its reverse (40024340412), we get a palindrome (61428682416).

The spelling of 21404342004 in words is "twenty-one billion, four hundred four million, three hundred forty-two thousand, four".