21312144342 has 48 divisors (see below), whose sum is σ = 46544254848. Its totient is φ = 7047665280.

The previous prime is 21312144331. The next prime is 21312144383. The reversal of 21312144342 is 24344121312.

21312144342 is a `hidden beast` number, since 2 + 1 + 312 + 1 + 4 + 4 + 342 = 666.

It is a super-2 number, since 2×21312144342² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1167042 + ... + 1185162.

It is an arithmetic number, because the mean of its divisors is an integer number (969671976).

Almost surely, 2^21312144342 is an apocalyptic number.

21312144342 is an abundant number, since it is smaller than the sum of its proper divisors (25232110506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21312144342 is a wasteful number, since it uses less digits than its factorization.

21312144342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18645 (or 18642 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21312144342 its reverse (24344121312), we get a palindrome (45656265654).

The spelling of 21312144342 in words is "twenty-one billion, three hundred twelve million, one hundred forty-four thousand, three hundred forty-two".