21243142102132 has 6 divisors (see below), whose sum is σ = 37175498678738. Its totient is φ = 10621571051064.

The previous prime is 21243142102111. The next prime is 21243142102151. The reversal of 21243142102132 is 23120124134212.

It can be written as a sum of positive squares in only one way, i.e., 21181680750736 + 61461351396 = 4602356^2 + 247914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21243142102132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655392762763 + ... + 2655392762770.

Almost surely, 2^{21243142102132} is an apocalyptic number.

It is an amenable number.

21243142102132 is a deficient number, since it is larger than the sum of its proper divisors (15932356576606).

21243142102132 is a wasteful number, since it uses less digits than its factorization.

21243142102132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310785525537 (or 5310785525535 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21243142102132 its reverse (23120124134212), we get a palindrome (44363266236344).

The spelling of 21243142102132 in words is "twenty-one trillion, two hundred forty-three billion, one hundred forty-two million, one hundred two thousand, one hundred thirty-two".