21114131243 has 4 divisors (see below), whose sum is σ = 21114460488. Its totient is φ = 21113802000.

The previous prime is 21114131231. The next prime is 21114131249. The reversal of 21114131243 is 34213141112.

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 21114131243 - 2⁸ = 21114130987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21114131249) 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, 33746 + ... + 208247.

It is an arithmetic number, because the mean of its divisors is an integer number (5278615122).

Almost surely, 2^21114131243 is an apocalyptic number.

21114131243 is a deficient number, since it is larger than the sum of its proper divisors (329245).

21114131243 is an equidigital number, since it uses as much as digits as its factorization.

21114131243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329244.

The product of its digits is 576, while the sum is 23.

Adding to 21114131243 its reverse (34213141112), we get a palindrome (55327272355).

The spelling of 21114131243 in words is "twenty-one billion, one hundred fourteen million, one hundred thirty-one thousand, two hundred forty-three".