21343442004 has 60 divisors (see below), whose sum is σ = 55810524000. Its totient is φ = 7112625552.

The previous prime is 21343441993. The next prime is 21343442023. The reversal of 21343442004 is 40024434312.

It is a happy number.

21343442004 is a `hidden beast` number, since 21 + 3 + 434 + 4 + 200 + 4 = 666.

It is a super-2 number, since 2×21343442004² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1866697 + ... + 1878095.

It is an arithmetic number, because the mean of its divisors is an integer number (930175400).

Almost surely, 2^21343442004 is an apocalyptic number.

It is an amenable number.

21343442004 is an abundant number, since it is smaller than the sum of its proper divisors (34467081996).

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

21343442004 is a wasteful number, since it uses less digits than its factorization.

21343442004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17194 (or 17183 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21343442004 its reverse (40024434312), we get a palindrome (61367876316).

The spelling of 21343442004 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-two thousand, four".