21403344042 has 32 divisors (see below), whose sum is σ = 47580730560. Its totient is φ = 7131786480.

The previous prime is 21403344023. The next prime is 21403344091. The reversal of 21403344042 is 24044330412.

It is a happy number.

21403344042 is a `hidden beast` number, since 214 + 0 + 3 + 3 + 440 + 4 + 2 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21403343997 and 21403344015.

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, 74908 + ... + 220040.

It is an arithmetic number, because the mean of its divisors is an integer number (1486897830).

Almost surely, 2^21403344042 is an apocalyptic number.

21403344042 is an abundant number, since it is smaller than the sum of its proper divisors (26177386518).

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

21403344042 is a wasteful number, since it uses less digits than its factorization.

21403344042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147875 (or 147869 counting only the distinct ones).

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

Adding to 21403344042 its reverse (24044330412), we get a palindrome (45447674454).

The spelling of 21403344042 in words is "twenty-one billion, four hundred three million, three hundred forty-four thousand, forty-two".