21140401231 has 2 divisors, whose sum is σ = 21140401232. Its totient is φ = 21140401230.

The previous prime is 21140401211. The next prime is 21140401253. The reversal of 21140401231 is 13210404112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21140401231 - 2⁷ = 21140401103 is a prime.

It is a super-2 number, since 2×21140401231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21140401199 and 21140401208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140401211) 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 as a sum of consecutive naturals, namely, 10570200615 + 10570200616.

It is an arithmetic number, because the mean of its divisors is an integer number (10570200616).

Almost surely, 2^21140401231 is an apocalyptic number.

21140401231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140401231 is an equidigital number, since it uses as much as digits as its factorization.

21140401231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21140401231 its reverse (13210404112), we get a palindrome (34350805343).

The spelling of 21140401231 in words is "twenty-one billion, one hundred forty million, four hundred one thousand, two hundred thirty-one".