21134444143 has 16 divisors (see below), whose sum is σ = 21798612000. Its totient is φ = 20478487680.

The previous prime is 21134444129. The next prime is 21134444161. The reversal of 21134444143 is 34144443112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21134444143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134474143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6796273 + ... + 6799381.

It is an arithmetic number, because the mean of its divisors is an integer number (1362413250).

Almost surely, 2^21134444143 is an apocalyptic number.

21134444143 is a deficient number, since it is larger than the sum of its proper divisors (664167857).

21134444143 is a wasteful number, since it uses less digits than its factorization.

21134444143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362.

The product of its digits is 18432, while the sum is 31.

Adding to 21134444143 its reverse (34144443112), we get a palindrome (55278887255).

The spelling of 21134444143 in words is "twenty-one billion, one hundred thirty-four million, four hundred forty-four thousand, one hundred forty-three".