21140401243 has 16 divisors (see below), whose sum is σ = 24108376320. Its totient is φ = 18376415136.

The previous prime is 21140401231. The next prime is 21140401253. The reversal of 21140401243 is 34210404112.

It is a happy number.

It is not a de Polignac number, because 21140401243 - 2⁵ = 21140401211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140401253) 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 in 15 ways as a sum of consecutive naturals, for example, 215005 + ... + 297502.

It is an arithmetic number, because the mean of its divisors is an integer number (1506773520).

Almost surely, 2^21140401243 is an apocalyptic number.

21140401243 is a deficient number, since it is larger than the sum of its proper divisors (2967975077).

21140401243 is a wasteful number, since it uses less digits than its factorization.

21140401243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512706.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21140401243 its reverse (34210404112), we get a palindrome (55350805355).

The spelling of 21140401243 in words is "twenty-one billion, one hundred forty million, four hundred one thousand, two hundred forty-three".