21140402243 has 8 divisors (see below), whose sum is σ = 21247804800. Its totient is φ = 21033131328.

The previous prime is 21140402237. The next prime is 21140402263. The reversal of 21140402243 is 34220404112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21140402243 - 2²⁰ = 21139353667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140402233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297455 + ... + 361607.

It is an arithmetic number, because the mean of its divisors is an integer number (2655975600).

Almost surely, 2^21140402243 is an apocalyptic number.

21140402243 is a deficient number, since it is larger than the sum of its proper divisors (107402557).

21140402243 is a wasteful number, since it uses less digits than its factorization.

21140402243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65821.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21140402243 its reverse (34220404112), we get a palindrome (55360806355).

The spelling of 21140402243 in words is "twenty-one billion, one hundred forty million, four hundred two thousand, two hundred forty-three".