23121055 has 4 divisors (see below), whose sum is σ = 27745272. Its totient is φ = 18496840.

The previous prime is 23121053. The next prime is 23121073. The reversal of 23121055 is 55012132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 23121055 - 2¹ = 23121053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312101 + ... + 2312110.

It is an arithmetic number, because the mean of its divisors is an integer number (6936318).

Almost surely, 2^23121055 is an apocalyptic number.

23121055 is a deficient number, since it is larger than the sum of its proper divisors (4624217).

23121055 is an equidigital number, since it uses as much as digits as its factorization.

23121055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624216.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 23121055 is about 4808.4358163544. The cubic root of 23121055 is about 284.8847589893.

Adding to 23121055 its reverse (55012132), we get a palindrome (78133187).

The spelling of 23121055 in words is "twenty-three million, one hundred twenty-one thousand, fifty-five".