21140430131 has 4 divisors (see below), whose sum is σ = 21222688872. Its totient is φ = 21058171392.

The previous prime is 21140430119. The next prime is 21140430137. The reversal of 21140430131 is 13103404112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140430131 is a prime.

It is a super-2 number, since 2×21140430131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140430137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41128985 + ... + 41129498.

It is an arithmetic number, because the mean of its divisors is an integer number (5305672218).

Almost surely, 2^21140430131 is an apocalyptic number.

21140430131 is a deficient number, since it is larger than the sum of its proper divisors (82258741).

21140430131 is an equidigital number, since it uses as much as digits as its factorization.

21140430131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82258740.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21140430131 its reverse (13103404112), we get a palindrome (34243834243).

The spelling of 21140430131 in words is "twenty-one billion, one hundred forty million, four hundred thirty thousand, one hundred thirty-one".