21342404043 has 16 divisors (see below), whose sum is σ = 32708666400. Its totient is φ = 13737638880.

The previous prime is 21342404033. The next prime is 21342404051. The reversal of 21342404043 is 34040424312.

It is a happy number.

21342404043 is a `hidden beast` number, since 2 + 13 + 4 + 240 + 404 + 3 = 666.

It is not a de Polignac number, because 21342404043 - 2⁸ = 21342403787 is a prime.

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 = 21342403998 and 21342404016.

It is not an unprimeable number, because it can be changed into a prime (21342404033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13627828 + ... + 13629393.

It is an arithmetic number, because the mean of its divisors is an integer number (2044291650).

Almost surely, 2^21342404043 is an apocalyptic number.

21342404043 is a deficient number, since it is larger than the sum of its proper divisors (11366262357).

21342404043 is a wasteful number, since it uses less digits than its factorization.

21342404043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27257259 (or 27257253 counting only the distinct ones).

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

Adding to 21342404043 its reverse (34040424312), we get a palindrome (55382828355).

The spelling of 21342404043 in words is "twenty-one billion, three hundred forty-two million, four hundred four thousand, forty-three".