21402130343 has 16 divisors (see below), whose sum is σ = 23620529184. Its totient is φ = 19229736960.

The previous prime is 21402130333. The next prime is 21402130367. The reversal of 21402130343 is 34303120412.

It is a cyclic number.

It is not a de Polignac number, because 21402130343 - 2²⁴ = 21385353127 is a prime.

It is a super-2 number, since 2×21402130343² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402130333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 794471 + ... + 820967.

It is an arithmetic number, because the mean of its divisors is an integer number (1476283074).

Almost surely, 2^21402130343 is an apocalyptic number.

21402130343 is a deficient number, since it is larger than the sum of its proper divisors (2218398841).

21402130343 is a wasteful number, since it uses less digits than its factorization.

21402130343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27362.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21402130343 its reverse (34303120412), we get a palindrome (55705250755).

The spelling of 21402130343 in words is "twenty-one billion, four hundred two million, one hundred thirty thousand, three hundred forty-three".