21140343031 has 4 divisors (see below), whose sum is σ = 21176357832. Its totient is φ = 21104328232.

The previous prime is 21140343023. The next prime is 21140343109. The reversal of 21140343031 is 13034304112.

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

It is a cyclic number.

It is not a de Polignac number, because 21140343031 - 2³ = 21140343023 is a prime.

It is a super-2 number, since 2×21140343031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140342993 and 21140343011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140340031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18006520 + ... + 18007693.

It is an arithmetic number, because the mean of its divisors is an integer number (5294089458).

Almost surely, 2^21140343031 is an apocalyptic number.

21140343031 is a deficient number, since it is larger than the sum of its proper divisors (36014801).

21140343031 is an equidigital number, since it uses as much as digits as its factorization.

21140343031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36014800.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21140343031 its reverse (13034304112), we get a palindrome (34174647143).

The spelling of 21140343031 in words is "twenty-one billion, one hundred forty million, three hundred forty-three thousand, thirty-one".