55421123111 has 4 divisors (see below), whose sum is σ = 55431080400. Its totient is φ = 55411165824.

The previous prime is 55421123077. The next prime is 55421123201. The reversal of 55421123111 is 11132112455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11132112455 = 5 ⋅2226422491.

It is a cyclic number.

It is not a de Polignac number, because 55421123111 - 2²² = 55416928807 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 (55421123011) 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, 4970291 + ... + 4981428.

It is an arithmetic number, because the mean of its divisors is an integer number (13857770100).

Almost surely, 2^55421123111 is an apocalyptic number.

55421123111 is a deficient number, since it is larger than the sum of its proper divisors (9957289).

55421123111 is an equidigital number, since it uses as much as digits as its factorization.

55421123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9957288.

The product of its digits is 1200, while the sum is 26.

Adding to 55421123111 its reverse (11132112455), we get a palindrome (66553235566).

The spelling of 55421123111 in words is "fifty-five billion, four hundred twenty-one million, one hundred twenty-three thousand, one hundred eleven".