21440342043 has 6 divisors (see below), whose sum is σ = 30969382964. Its totient is φ = 14293561356.

The previous prime is 21440341999. The next prime is 21440342069. The reversal of 21440342043 is 34024304412.

It is a happy number.

21440342043 is a `hidden beast` number, since 214 + 403 + 4 + 2 + 0 + 43 = 666.

It is not a de Polignac number, because 21440342043 - 2²⁹ = 20903471131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21440341998 and 21440342016.

It is not an unprimeable number, because it can be changed into a prime (21440342243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191130105 + ... + 1191130122.

Almost surely, 2^21440342043 is an apocalyptic number.

21440342043 is a deficient number, since it is larger than the sum of its proper divisors (9529040921).

21440342043 is a wasteful number, since it uses less digits than its factorization.

21440342043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382260233 (or 2382260230 counting only the distinct ones).

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

Adding to 21440342043 its reverse (34024304412), we get a palindrome (55464646455).

The spelling of 21440342043 in words is "twenty-one billion, four hundred forty million, three hundred forty-two thousand, forty-three".