221011245 has 96 divisors (see below), whose sum is σ = 486979584. Its totient is φ = 90201600.

The previous prime is 221011243. The next prime is 221011267. The reversal of 221011245 is 542110122.

It is not a de Polignac number, because 221011245 - 2¹ = 221011243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011243) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 126075 + ... + 127815.

It is an arithmetic number, because the mean of its divisors is an integer number (5072704).

Almost surely, 2^221011245 is an apocalyptic number.

It is an amenable number.

221011245 is an abundant number, since it is smaller than the sum of its proper divisors (265968339).

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

221011245 is a wasteful number, since it uses less digits than its factorization.

221011245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221011245 is about 14866.4469527860. The cubic root of 221011245 is about 604.6046138219.

Adding to 221011245 its reverse (542110122), we get a palindrome (763121367).

The spelling of 221011245 in words is "two hundred twenty-one million, eleven thousand, two hundred forty-five".