21004130343 has 32 divisors (see below), whose sum is σ = 33910424064. Its totient is φ = 11289203712.

The previous prime is 21004130341. The next prime is 21004130369. The reversal of 21004130343 is 34303140012.

It is not a de Polignac number, because 21004130343 - 2¹ = 21004130341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004130341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 573796 + ... + 609302.

It is an arithmetic number, because the mean of its divisors is an integer number (1059700752).

Almost surely, 2^21004130343 is an apocalyptic number.

21004130343 is a deficient number, since it is larger than the sum of its proper divisors (12906293721).

21004130343 is a wasteful number, since it uses less digits than its factorization.

21004130343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37191.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21004130343 its reverse (34303140012), we get a palindrome (55307270355).

The spelling of 21004130343 in words is "twenty-one billion, four million, one hundred thirty thousand, three hundred forty-three".