221201136 has 60 divisors (see below), whose sum is σ = 666681288. Its totient is φ = 68061312.

The previous prime is 221201131. The next prime is 221201137. The reversal of 221201136 is 631102122.

221201136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57210 + ... + 60953.

Almost surely, 2^221201136 is an apocalyptic number.

221201136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221201136 is an abundant number, since it is smaller than the sum of its proper divisors (445480152).

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

221201136 is a wasteful number, since it uses less digits than its factorization.

221201136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118190 (or 118181 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 221201136 is about 14872.8321445514. The cubic root of 221201136 is about 604.7777213176. Note that the first 4 decimals are identical.

Adding to 221201136 its reverse (631102122), we get a palindrome (852303258).

The spelling of 221201136 in words is "two hundred twenty-one million, two hundred one thousand, one hundred thirty-six".