21140431033243 has 4 divisors (see below), whose sum is σ = 21539307090528. Its totient is φ = 20741554975960.

The previous prime is 21140431033229. The next prime is 21140431033289. The reversal of 21140431033243 is 34233013404112.

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-21140431033243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21140431034243) 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, 199438028563 + ... + 199438028668.

It is an arithmetic number, because the mean of its divisors is an integer number (5384826772632).

Almost surely, 2^{21140431033243} is an apocalyptic number.

21140431033243 is a deficient number, since it is larger than the sum of its proper divisors (398876057285).

21140431033243 is an equidigital number, since it uses as much as digits as its factorization.

21140431033243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398876057284.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21140431033243 its reverse (34233013404112), we get a palindrome (55373444437355).

The spelling of 21140431033243 in words is "twenty-one trillion, one hundred forty billion, four hundred thirty-one million, thirty-three thousand, two hundred forty-three".