21143405141 has 4 divisors (see below), whose sum is σ = 21501768000. Its totient is φ = 20785042284.

The previous prime is 21143405131. The next prime is 21143405149. The reversal of 21143405141 is 14150434112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21143405141 - 2¹⁸ = 21143142997 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 21143405141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143405149) 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, 179181341 + ... + 179181458.

It is an arithmetic number, because the mean of its divisors is an integer number (5375442000).

Almost surely, 2^21143405141 is an apocalyptic number.

It is an amenable number.

21143405141 is a deficient number, since it is larger than the sum of its proper divisors (358362859).

21143405141 is an equidigital number, since it uses as much as digits as its factorization.

21143405141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358362858.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21143405141 its reverse (14150434112), we get a palindrome (35293839253).

The spelling of 21143405141 in words is "twenty-one billion, one hundred forty-three million, four hundred five thousand, one hundred forty-one".