21233240121 has 8 divisors (see below), whose sum is σ = 28348192224. Its totient is φ = 14136890720.

The previous prime is 21233240117. The next prime is 21233240143. The reversal of 21233240121 is 12104233212.

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 21233240121 - 2² = 21233240117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233247121) 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, 4648011 + ... + 4652576.

It is an arithmetic number, because the mean of its divisors is an integer number (3543524028).

Almost surely, 2^21233240121 is an apocalyptic number.

It is an amenable number.

21233240121 is a deficient number, since it is larger than the sum of its proper divisors (7114952103).

21233240121 is an equidigital number, since it uses as much as digits as its factorization.

21233240121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9301351.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21233240121 its reverse (12104233212), we get a palindrome (33337473333).

The spelling of 21233240121 in words is "twenty-one billion, two hundred thirty-three million, two hundred forty thousand, one hundred twenty-one".