21440242431233 has 32 divisors (see below), whose sum is σ = 23174232648192. Its totient is φ = 19760286873600.

The previous prime is 21440242431193. The next prime is 21440242431241. The reversal of 21440242431233 is 33213424204412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21440242431233 - 2⁸ = 21440242430977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21440242431193 and 21440242431202.

It is not an unprimeable number, because it can be changed into a prime (21440242431253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1059656885 + ... + 1059677117.

It is an arithmetic number, because the mean of its divisors is an integer number (724194770256).

Almost surely, 2^{21440242431233} is an apocalyptic number.

It is an amenable number.

21440242431233 is a deficient number, since it is larger than the sum of its proper divisors (1733990216959).

21440242431233 is a wasteful number, since it uses less digits than its factorization.

21440242431233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22505.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 21440242431233 its reverse (33213424204412), we get a palindrome (54653666635645).

The spelling of 21440242431233 in words is "twenty-one trillion, four hundred forty billion, two hundred forty-two million, four hundred thirty-one thousand, two hundred thirty-three".