21140003431 has 2 divisors, whose sum is σ = 21140003432. Its totient is φ = 21140003430.

The previous prime is 21140003407. The next prime is 21140003453. The reversal of 21140003431 is 13430004112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21140003431 - 2¹¹ = 21140001383 is a prime.

It is a super-2 number, since 2×21140003431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21140003399 and 21140003408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140003831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570001715 + 10570001716.

It is an arithmetic number, because the mean of its divisors is an integer number (10570001716).

Almost surely, 2^21140003431 is an apocalyptic number.

21140003431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140003431 is an equidigital number, since it uses as much as digits as its factorization.

21140003431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21140003431 its reverse (13430004112), we get a palindrome (34570007543).

The spelling of 21140003431 in words is "twenty-one billion, one hundred forty million, three thousand, four hundred thirty-one".