221404995 has 80 divisors (see below), whose sum is σ = 469402560. Its totient is φ = 97687296.

The previous prime is 221404987. The next prime is 221404999. The reversal of 221404995 is 599404122.

221404995 is a `hidden beast` number, since 22 + 140 + 499 + 5 = 666.

It is not a de Polignac number, because 221404995 - 2³ = 221404987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221404999) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 80869 + ... + 83561.

It is an arithmetic number, because the mean of its divisors is an integer number (5867532).

Almost surely, 2^221404995 is an apocalyptic number.

221404995 is an abundant number, since it is smaller than the sum of its proper divisors (247997565).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221404995 is a wasteful number, since it uses less digits than its factorization.

221404995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 221404995 is about 14879.6839684181. The cubic root of 221404995 is about 604.9634520189.

It can be divided in two parts, 2214049 and 95, that added together give a square (2214144 = 1488²).

The spelling of 221404995 in words is "two hundred twenty-one million, four hundred four thousand, nine hundred ninety-five".