21143234013 has 16 divisors (see below), whose sum is σ = 30756518400. Its totient is φ = 12812946480.

The previous prime is 21143233987. The next prime is 21143234053. The reversal of 21143234013 is 31043234112.

It is a happy number.

It is not a de Polignac number, because 21143234013 - 2⁵ = 21143233981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143234053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492858 + ... + 534036.

It is an arithmetic number, because the mean of its divisors is an integer number (1922282400).

Almost surely, 2^21143234013 is an apocalyptic number.

It is an amenable number.

21143234013 is a deficient number, since it is larger than the sum of its proper divisors (9613284387).

21143234013 is a wasteful number, since it uses less digits than its factorization.

21143234013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56752.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21143234013 its reverse (31043234112), we get a palindrome (52186468125).

Subtracting 21143234013 from its reverse (31043234112), we obtain a palindrome (9900000099).

The spelling of 21143234013 in words is "twenty-one billion, one hundred forty-three million, two hundred thirty-four thousand, thirteen".