23121222001 has 4 divisors (see below), whose sum is σ = 23867067904. Its totient is φ = 22375376100.

The previous prime is 23121221989. The next prime is 23121222017. The reversal of 23121222001 is 10022212132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23121222001 - 2⁹ = 23121221489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23121222101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372922905 + ... + 372922966.

It is an arithmetic number, because the mean of its divisors is an integer number (5966766976).

Almost surely, 2^23121222001 is an apocalyptic number.

It is an amenable number.

23121222001 is a deficient number, since it is larger than the sum of its proper divisors (745845903).

23121222001 is an equidigital number, since it uses as much as digits as its factorization.

23121222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745845902.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 23121222001 its reverse (10022212132), we get a palindrome (33143434133).

The spelling of 23121222001 in words is "twenty-three billion, one hundred twenty-one million, two hundred twenty-two thousand, one".