55221071 has 4 divisors (see below), whose sum is σ = 56263032. Its totient is φ = 54179112.

The previous prime is 55221059. The next prime is 55221077. The reversal of 55221071 is 17012255.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55221071 - 2⁶ = 55221007 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 (55221077) 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, 520901 + ... + 521006.

It is an arithmetic number, because the mean of its divisors is an integer number (14065758).

Almost surely, 2^55221071 is an apocalyptic number.

55221071 is a deficient number, since it is larger than the sum of its proper divisors (1041961).

55221071 is a wasteful number, since it uses less digits than its factorization.

55221071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041960.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 55221071 is about 7431.0881437378. The cubic root of 55221071 is about 380.8040937075.

The spelling of 55221071 in words is "fifty-five million, two hundred twenty-one thousand, seventy-one".