55421811 has 6 divisors (see below), whose sum is σ = 80053740. Its totient is φ = 36947868.

The previous prime is 55421783. The next prime is 55421833. The reversal of 55421811 is 11812455.

It is not a de Polignac number, because 55421811 - 2⁶ = 55421747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55421851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3078981 + ... + 3078998.

It is an arithmetic number, because the mean of its divisors is an integer number (13342290).

Almost surely, 2^55421811 is an apocalyptic number.

55421811 is a deficient number, since it is larger than the sum of its proper divisors (24631929).

55421811 is a wasteful number, since it uses less digits than its factorization.

55421811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6157985 (or 6157982 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 55421811 is about 7444.5826612376. The cubic root of 55421811 is about 381.2649695457.

The spelling of 55421811 in words is "fifty-five million, four hundred twenty-one thousand, eight hundred eleven".