55221995 has 4 divisors (see below), whose sum is σ = 66266400. Its totient is φ = 44177592.

The previous prime is 55221979. The next prime is 55221997. The reversal of 55221995 is 59912255.

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 55221995 - 2⁴ = 55221979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55221997) 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, 5522195 + ... + 5522204.

It is an arithmetic number, because the mean of its divisors is an integer number (16566600).

Almost surely, 2^55221995 is an apocalyptic number.

55221995 is a deficient number, since it is larger than the sum of its proper divisors (11044405).

55221995 is a wasteful number, since it uses less digits than its factorization.

55221995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11044404.

The product of its digits is 40500, while the sum is 38.

The square root of 55221995 is about 7431.1503147225. The cubic root of 55221995 is about 380.8062176613.

The spelling of 55221995 in words is "fifty-five million, two hundred twenty-one thousand, nine hundred ninety-five".