21140400143 has 4 divisors (see below), whose sum is σ = 21140699400. Its totient is φ = 21140100888.

The previous prime is 21140400139. The next prime is 21140400209. The reversal of 21140400143 is 34100404112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21140400143 - 2² = 21140400139 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 (21140400943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21821 + ... + 206777.

It is an arithmetic number, because the mean of its divisors is an integer number (5285174850).

Almost surely, 2^21140400143 is an apocalyptic number.

21140400143 is a deficient number, since it is larger than the sum of its proper divisors (299257).

21140400143 is a wasteful number, since it uses less digits than its factorization.

21140400143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299256.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21140400143 its reverse (34100404112), we get a palindrome (55240804255).

The spelling of 21140400143 in words is "twenty-one billion, one hundred forty million, four hundred thousand, one hundred forty-three".