21042134312 has 8 divisors (see below), whose sum is σ = 39454001850. Its totient is φ = 10521067152.

The previous prime is 21042134299. The next prime is 21042134339. The reversal of 21042134312 is 21343124012.

It can be written as a sum of positive squares in only one way, i.e., 16168139716 + 4873994596 = 127154^2 + 69814^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315133387 + ... + 1315133402.

Almost surely, 2^21042134312 is an apocalyptic number.

It is an amenable number.

21042134312 is a deficient number, since it is larger than the sum of its proper divisors (18411867538).

21042134312 is a wasteful number, since it uses less digits than its factorization.

21042134312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630266795 (or 2630266791 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21042134312 its reverse (21343124012), we get a palindrome (42385258324).

The spelling of 21042134312 in words is "twenty-one billion, forty-two million, one hundred thirty-four thousand, three hundred twelve".