55221365 has 8 divisors (see below), whose sum is σ = 68550840. Its totient is φ = 42653632.

The previous prime is 55221359. The next prime is 55221373. The reversal of 55221365 is 56312255.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 948676 + 54272689 = 974^2 + 7367^2 .

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 55221365 - 2¹⁶ = 55155829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190274 + ... + 190563.

It is an arithmetic number, because the mean of its divisors is an integer number (8568855).

Almost surely, 2^55221365 is an apocalyptic number.

It is an amenable number.

55221365 is a deficient number, since it is larger than the sum of its proper divisors (13329475).

55221365 is a wasteful number, since it uses less digits than its factorization.

55221365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380871.

The product of its digits is 9000, while the sum is 29.

The square root of 55221365 is about 7431.1079254711. The cubic root of 55221365 is about 380.8047695135.

The spelling of 55221365 in words is "fifty-five million, two hundred twenty-one thousand, three hundred sixty-five".