55571421 has 8 divisors (see below), whose sum is σ = 74539584. Its totient is φ = 36825440.

The previous prime is 55571407. The next prime is 55571443. The reversal of 55571421 is 12417555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55571421 - 2⁵ = 55571389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55571491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54960 + ... + 55961.

It is an arithmetic number, because the mean of its divisors is an integer number (9317448).

Almost surely, 2^55571421 is an apocalyptic number.

It is an amenable number.

55571421 is a deficient number, since it is larger than the sum of its proper divisors (18968163).

55571421 is a wasteful number, since it uses less digits than its factorization.

55571421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111091.

The product of its digits is 7000, while the sum is 30.

The square root of 55571421 is about 7454.6241353941. The cubic root of 55571421 is about 381.6077335278.

Adding to 55571421 its reverse (12417555), we get a palindrome (67988976).

The spelling of 55571421 in words is "fifty-five million, five hundred seventy-one thousand, four hundred twenty-one".