21534122142 has 24 divisors (see below), whose sum is σ = 50246285544. Its totient is φ = 6625883664.

The previous prime is 21534122119. The next prime is 21534122147. The reversal of 21534122142 is 24122143512.

21534122142 is a `hidden beast` number, since 2 + 1 + 534 + 122 + 1 + 4 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534122147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46012848 + ... + 46013315.

It is an arithmetic number, because the mean of its divisors is an integer number (2093595231).

Almost surely, 2^21534122142 is an apocalyptic number.

21534122142 is an abundant number, since it is smaller than the sum of its proper divisors (28712163402).

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

21534122142 is a wasteful number, since it uses less digits than its factorization.

21534122142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92026184 (or 92026181 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

Adding to 21534122142 its reverse (24122143512), we get a palindrome (45656265654).

The spelling of 21534122142 in words is "twenty-one billion, five hundred thirty-four million, one hundred twenty-two thousand, one hundred forty-two".