21442113403 has 4 divisors (see below), whose sum is σ = 21713532640. Its totient is φ = 21170694168.

The previous prime is 21442113391. The next prime is 21442113421. The reversal of 21442113403 is 30431124412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442113403 is a prime.

It is a super-2 number, since 2×21442113403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21442123403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135709500 + ... + 135709657.

It is an arithmetic number, because the mean of its divisors is an integer number (5428383160).

Almost surely, 2^21442113403 is an apocalyptic number.

21442113403 is a deficient number, since it is larger than the sum of its proper divisors (271419237).

21442113403 is an equidigital number, since it uses as much as digits as its factorization.

21442113403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271419236.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21442113403 its reverse (30431124412), we get a palindrome (51873237815).

The spelling of 21442113403 in words is "twenty-one billion, four hundred forty-two million, one hundred thirteen thousand, four hundred three".