21143331413 has 4 divisors (see below), whose sum is σ = 21143624460. Its totient is φ = 21143038368.

The previous prime is 21143331389. The next prime is 21143331431. The reversal of 21143331413 is 31413334112.

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 can be written as a sum of positive squares in 2 ways, for example, as 8009713009 + 13133618404 = 89497^2 + 114602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21143331413 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 (21143331113) 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, 46193 + ... + 210761.

It is an arithmetic number, because the mean of its divisors is an integer number (5285906115).

Almost surely, 2^21143331413 is an apocalyptic number.

It is an amenable number.

21143331413 is a deficient number, since it is larger than the sum of its proper divisors (293047).

21143331413 is a wasteful number, since it uses less digits than its factorization.

21143331413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293046.

The product of its digits is 2592, while the sum is 26.

Adding to 21143331413 its reverse (31413334112), we get a palindrome (52556665525).

The spelling of 21143331413 in words is "twenty-one billion, one hundred forty-three million, three hundred thirty-one thousand, four hundred thirteen".