21342144004 has 24 divisors (see below), whose sum is σ = 37447300800. Its totient is φ = 10642945440.

The previous prime is 21342143989. The next prime is 21342144007. The reversal of 21342144004 is 40044124312.

It is a super-2 number, since 2×21342144004² (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 21342144004.

It is not an unprimeable number, because it can be changed into a prime (21342144007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4336257 + ... + 4341175.

It is an arithmetic number, because the mean of its divisors is an integer number (1560304200).

Almost surely, 2^21342144004 is an apocalyptic number.

It is an amenable number.

21342144004 is a deficient number, since it is larger than the sum of its proper divisors (16105156796).

21342144004 is a wasteful number, since it uses less digits than its factorization.

21342144004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7563 (or 7561 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21342144004 its reverse (40044124312), we get a palindrome (61386268316).

The spelling of 21342144004 in words is "twenty-one billion, three hundred forty-two million, one hundred forty-four thousand, four".