21143143333 has 6 divisors (see below), whose sum is σ = 22894646514. Its totient is φ = 19516747536.

The previous prime is 21143143313. The next prime is 21143143363. The reversal of 21143143333 is 33334134112.

It can be written as a sum of positive squares in 3 ways, for example, as 2772864964 + 18370278369 = 52658^2 + 135537^2 .

It is not a de Polignac number, because 21143143333 - 2²¹ = 21141046181 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 (21143143313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62553510 + ... + 62553847.

It is an arithmetic number, because the mean of its divisors is an integer number (3815774419).

Almost surely, 2^21143143333 is an apocalyptic number.

It is an amenable number.

21143143333 is a deficient number, since it is larger than the sum of its proper divisors (1751503181).

21143143333 is a wasteful number, since it uses less digits than its factorization.

21143143333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125107383 (or 125107370 counting only the distinct ones).

The product of its digits is 7776, while the sum is 28.

Adding to 21143143333 its reverse (33334134112), we get a palindrome (54477277445).

The spelling of 21143143333 in words is "twenty-one billion, one hundred forty-three million, one hundred forty-three thousand, three hundred thirty-three".