55071421 has 4 divisors (see below), whose sum is σ = 55184992. Its totient is φ = 54957852.

The previous prime is 55071409. The next prime is 55071437. The reversal of 55071421 is 12417055.

55071421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 55071421 - 2¹⁷ = 54940349 is a prime.

It is a super-2 number, since 2×55071421² = 6065722821918482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55074421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56055 + ... + 57028.

It is an arithmetic number, because the mean of its divisors is an integer number (13796248).

Almost surely, 2^55071421 is an apocalyptic number.

It is an amenable number.

55071421 is a deficient number, since it is larger than the sum of its proper divisors (113571).

55071421 is a wasteful number, since it uses less digits than its factorization.

55071421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113570.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 55071421 is about 7421.0121277357. The cubic root of 55071421 is about 380.4597874001.

Adding to 55071421 its reverse (12417055), we get a palindrome (67488476).

The spelling of 55071421 in words is "fifty-five million, seventy-one thousand, four hundred twenty-one".