21423110042 has 8 divisors (see below), whose sum is σ = 32369225076. Its totient is φ = 10633368352.

The previous prime is 21423110029. The next prime is 21423110047. The reversal of 21423110042 is 24001132412.

It can be written as a sum of positive squares in 2 ways, for example, as 21357191881 + 65918161 = 146141^2 + 8119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21423109996 and 21423110023.

It is not an unprimeable number, because it can be changed into a prime (21423110047) 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, 39092993 + ... + 39093540.

Almost surely, 2^21423110042 is an apocalyptic number.

21423110042 is a deficient number, since it is larger than the sum of its proper divisors (10946115034).

21423110042 is a wasteful number, since it uses less digits than its factorization.

21423110042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78186672.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21423110042 its reverse (24001132412), we get a palindrome (45424242454).

The spelling of 21423110042 in words is "twenty-one billion, four hundred twenty-three million, one hundred ten thousand, forty-two".