21040214243 has 8 divisors (see below), whose sum is σ = 22746178320. Its totient is φ = 19394108640.

The previous prime is 21040214179. The next prime is 21040214263. The reversal of 21040214243 is 34241204012.

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

It is not a de Polignac number, because 21040214243 - 2⁶ = 21040214179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21040214263) 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, 14963888 + ... + 14965293.

It is an arithmetic number, because the mean of its divisors is an integer number (2843272290).

Almost surely, 2^21040214243 is an apocalyptic number.

21040214243 is a deficient number, since it is larger than the sum of its proper divisors (1705964077).

21040214243 is a wasteful number, since it uses less digits than its factorization.

21040214243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29929237.

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

Adding to 21040214243 its reverse (34241204012), we get a palindrome (55281418255).

The spelling of 21040214243 in words is "twenty-one billion, forty million, two hundred fourteen thousand, two hundred forty-three".