55421971 has 8 divisors (see below), whose sum is σ = 60657264. Its totient is φ = 50219520.

The previous prime is 55421963. The next prime is 55421999. The reversal of 55421971 is 17912455.

55421971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55421971 - 2³ = 55421963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55401971) 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 7 ways as a sum of consecutive naturals, for example, 4606 + ... + 11491.

It is an arithmetic number, because the mean of its divisors is an integer number (7582158).

Almost surely, 2^55421971 is an apocalyptic number.

55421971 is a deficient number, since it is larger than the sum of its proper divisors (5235293).

55421971 is a wasteful number, since it uses less digits than its factorization.

55421971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16421.

The product of its digits is 12600, while the sum is 34.

The square root of 55421971 is about 7444.5934072990. The cubic root of 55421971 is about 381.2653364430.

The spelling of 55421971 in words is "fifty-five million, four hundred twenty-one thousand, nine hundred seventy-one".