55133055421 has 4 divisors (see below), whose sum is σ = 58034795200. Its totient is φ = 52231315644.

The previous prime is 55133055407. The next prime is 55133055431. The reversal of 55133055421 is 12455033155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55133055421 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 (55133055401) 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, 1450869861 + ... + 1450869898.

It is an arithmetic number, because the mean of its divisors is an integer number (14508698800).

Almost surely, 2^55133055421 is an apocalyptic number.

It is an amenable number.

55133055421 is a deficient number, since it is larger than the sum of its proper divisors (2901739779).

55133055421 is a wasteful number, since it uses less digits than its factorization.

55133055421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901739778.

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 55133055421 its reverse (12455033155), we get a palindrome (67588088576).

The spelling of 55133055421 in words is "fifty-five billion, one hundred thirty-three million, fifty-five thousand, four hundred twenty-one".