21042242307 has 6 divisors (see below), whose sum is σ = 30394350012. Its totient is φ = 14028161532.

The previous prime is 21042242219. The next prime is 21042242311. The reversal of 21042242307 is 70324224012.

21042242307 is a `hidden beast` number, since 2 + 1 + 0 + 422 + 4 + 230 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21042242307 is a prime.

It is a super-2 number, since 2×21042242307² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21042242357) 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, 1169013453 + ... + 1169013470.

It is an arithmetic number, because the mean of its divisors is an integer number (5065725002).

Almost surely, 2^21042242307 is an apocalyptic number.

21042242307 is a deficient number, since it is larger than the sum of its proper divisors (9352107705).

21042242307 is a wasteful number, since it uses less digits than its factorization.

21042242307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338026929 (or 2338026926 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

Adding to 21042242307 its reverse (70324224012), we get a palindrome (91366466319).

The spelling of 21042242307 in words is "twenty-one billion, forty-two million, two hundred forty-two thousand, three hundred seven".