21423102142 has 12 divisors (see below), whose sum is σ = 34796696040. Its totient is φ = 9887585448.

The previous prime is 21423102133. The next prime is 21423102179. The reversal of 21423102142 is 24120132412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31690642 + ... + 31691317.

It is an arithmetic number, because the mean of its divisors is an integer number (2899724670).

Almost surely, 2^21423102142 is an apocalyptic number.

21423102142 is a deficient number, since it is larger than the sum of its proper divisors (13373593898).

21423102142 is a wasteful number, since it uses less digits than its factorization.

21423102142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63381987 (or 63381974 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21423102142 its reverse (24120132412), we get a palindrome (45543234554).

The spelling of 21423102142 in words is "twenty-one billion, four hundred twenty-three million, one hundred two thousand, one hundred forty-two".