55421995 has 4 divisors (see below), whose sum is σ = 66506400. Its totient is φ = 44337592.

The previous prime is 55421963. The next prime is 55421999. The reversal of 55421995 is 59912455.

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 55421995 - 2⁵ = 55421963 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (55421999) 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, 5542195 + ... + 5542204.

It is an arithmetic number, because the mean of its divisors is an integer number (16626600).

Almost surely, 2^55421995 is an apocalyptic number.

55421995 is a deficient number, since it is larger than the sum of its proper divisors (11084405).

55421995 is a wasteful number, since it uses less digits than its factorization.

55421995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11084404.

The product of its digits is 81000, while the sum is 40.

The square root of 55421995 is about 7444.5950192069. The cubic root of 55421995 is about 381.2653914775.

The spelling of 55421995 in words is "fifty-five million, four hundred twenty-one thousand, nine hundred ninety-five".