23121054155 has 16 divisors (see below), whose sum is σ = 27806392800. Its totient is φ = 18456142080.

The previous prime is 23121054133. The next prime is 23121054169. The reversal of 23121054155 is 55145012132.

It is not a de Polignac number, because 23121054155 - 2¹² = 23121050059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5584076 + ... + 5588214.

It is an arithmetic number, because the mean of its divisors is an integer number (1737899550).

Almost surely, 2^23121054155 is an apocalyptic number.

23121054155 is a deficient number, since it is larger than the sum of its proper divisors (4685338645).

23121054155 is a wasteful number, since it uses less digits than its factorization.

23121054155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6334.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 23121054155 its reverse (55145012132), we get a palindrome (78266066287).

The spelling of 23121054155 in words is "twenty-three billion, one hundred twenty-one million, fifty-four thousand, one hundred fifty-five".