21023321243 has 8 divisors (see below), whose sum is σ = 21845216256. Its totient is φ = 20210409000.

The previous prime is 21023321237. The next prime is 21023321273. The reversal of 21023321243 is 34212332012.

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 21023321243 - 2²² = 21019126939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023321203) 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, 2240921 + ... + 2250282.

It is an arithmetic number, because the mean of its divisors is an integer number (2730652032).

Almost surely, 2^21023321243 is an apocalyptic number.

21023321243 is a deficient number, since it is larger than the sum of its proper divisors (821895013).

21023321243 is a wasteful number, since it uses less digits than its factorization.

21023321243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491385.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21023321243 its reverse (34212332012), we get a palindrome (55235653255).

The spelling of 21023321243 in words is "twenty-one billion, twenty-three million, three hundred twenty-one thousand, two hundred forty-three".