21431000113 has 2 divisors, whose sum is σ = 21431000114. Its totient is φ = 21431000112.

The previous prime is 21431000081. The next prime is 21431000117. The reversal of 21431000113 is 31100013412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21201689664 + 229310449 = 145608^2 + 15143^2 .

It is a cyclic number.

It is not a de Polignac number, because 21431000113 - 2⁵ = 21431000081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21431000117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715500056 + 10715500057.

It is an arithmetic number, because the mean of its divisors is an integer number (10715500057).

Almost surely, 2^21431000113 is an apocalyptic number.

It is an amenable number.

21431000113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431000113 is an equidigital number, since it uses as much as digits as its factorization.

21431000113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21431000113 its reverse (31100013412), we get a palindrome (52531013525).

It can be divided in two parts, 21 and 431000113, that added together give a palindrome (431000134).

The spelling of 21431000113 in words is "twenty-one billion, four hundred thirty-one million, one hundred thirteen", and thus it is an aban number.