221131485 has 16 divisors (see below), whose sum is σ = 393122880. Its totient is φ = 117936720.

The previous prime is 221131459. The next prime is 221131489. The reversal of 221131485 is 584131122.

It is not a de Polignac number, because 221131485 - 2⁷ = 221131357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818871 + ... + 819140.

It is an arithmetic number, because the mean of its divisors is an integer number (24570180).

Almost surely, 2^221131485 is an apocalyptic number.

It is an amenable number.

221131485 is a deficient number, since it is larger than the sum of its proper divisors (171991395).

221131485 is a wasteful number, since it uses less digits than its factorization.

221131485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638025 (or 1638019 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 221131485 is about 14870.4904088601. The cubic root of 221131485 is about 604.7142379259.

The spelling of 221131485 in words is "two hundred twenty-one million, one hundred thirty-one thousand, four hundred eighty-five".