21040001343 has 40 divisors (see below), whose sum is σ = 31647646800. Its totient is φ = 13929864192.

The previous prime is 21040001327. The next prime is 21040001383. The reversal of 21040001343 is 34310004012.

21040001343 is a `hidden beast` number, since 210 + 400 + 0 + 13 + 43 = 666.

It is not a de Polignac number, because 21040001343 - 2⁴ = 21040001327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040001383) 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 39 ways as a sum of consecutive naturals, for example, 16711048 + ... + 16712306.

It is an arithmetic number, because the mean of its divisors is an integer number (791191170).

Almost surely, 2^21040001343 is an apocalyptic number.

21040001343 is a deficient number, since it is larger than the sum of its proper divisors (10607645457).

21040001343 is a wasteful number, since it uses less digits than its factorization.

21040001343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21040001343 its reverse (34310004012), we get a palindrome (55350005355).

The spelling of 21040001343 in words is "twenty-one billion, forty million, one thousand, three hundred forty-three".