55121057111 has 4 divisors (see below), whose sum is σ = 58022165400. Its totient is φ = 52219948824.

The previous prime is 55121057099. The next prime is 55121057119. The reversal of 55121057111 is 11175012155.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 55121057111 - 2¹⁴ = 55121040727 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 (55121057119) 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, 1450554116 + ... + 1450554153.

It is an arithmetic number, because the mean of its divisors is an integer number (14505541350).

Almost surely, 2^55121057111 is an apocalyptic number.

55121057111 is a deficient number, since it is larger than the sum of its proper divisors (2901108289).

55121057111 is a wasteful number, since it uses less digits than its factorization.

55121057111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901108288.

The product of its (nonzero) digits is 1750, while the sum is 29.

Adding to 55121057111 its reverse (11175012155), we get a palindrome (66296069266).

The spelling of 55121057111 in words is "fifty-five billion, one hundred twenty-one million, fifty-seven thousand, one hundred eleven".