21132012043 has 4 divisors (see below), whose sum is σ = 21142081800. Its totient is φ = 21121942288.

The previous prime is 21132012037. The next prime is 21132012073. The reversal of 21132012043 is 34021023112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21132012043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21132012043.

It is not an unprimeable number, because it can be changed into a prime (21132012073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5031730 + ... + 5035927.

It is an arithmetic number, because the mean of its divisors is an integer number (5285520450).

Almost surely, 2^21132012043 is an apocalyptic number.

21132012043 is a deficient number, since it is larger than the sum of its proper divisors (10069757).

21132012043 is a wasteful number, since it uses less digits than its factorization.

21132012043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10069756.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21132012043 its reverse (34021023112), we get a palindrome (55153035155).

The spelling of 21132012043 in words is "twenty-one billion, one hundred thirty-two million, twelve thousand, forty-three".