221146636 has 12 divisors (see below), whose sum is σ = 387817920. Its totient is φ = 110341520.

The previous prime is 221146619. The next prime is 221146649. The reversal of 221146636 is 636641122.

221146636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221146636² = 97811669228232992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221146598 and 221146607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55795 + ... + 59626.

It is an arithmetic number, because the mean of its divisors is an integer number (32318160).

Almost surely, 2^221146636 is an apocalyptic number.

It is an amenable number.

221146636 is a deficient number, since it is larger than the sum of its proper divisors (166671284).

221146636 is a wasteful number, since it uses less digits than its factorization.

221146636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115904 (or 115902 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 221146636 is about 14870.9998318876. Note that the first 3 decimals coincide. The cubic root of 221146636 is about 604.7280484366.

Adding to 221146636 its reverse (636641122), we get a palindrome (857787758).

The spelling of 221146636 in words is "two hundred twenty-one million, one hundred forty-six thousand, six hundred thirty-six".