23121220011 has 8 divisors (see below), whose sum is σ = 30872910144. Its totient is φ = 15391838280.

The previous prime is 23121219943. The next prime is 23121220019. The reversal of 23121220011 is 11002212132.

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

It is not a de Polignac number, because 23121220011 - 2¹⁹ = 23120695723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23121220019) 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, 5574681 + ... + 5578826.

It is an arithmetic number, because the mean of its divisors is an integer number (3859113768).

Almost surely, 2^23121220011 is an apocalyptic number.

23121220011 is a deficient number, since it is larger than the sum of its proper divisors (7751690133).

23121220011 is a wasteful number, since it uses less digits than its factorization.

23121220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11154201.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 23121220011 its reverse (11002212132), we get a palindrome (34123432143).

The spelling of 23121220011 in words is "twenty-three billion, one hundred twenty-one million, two hundred twenty thousand, eleven".