221231633 has 16 divisors (see below), whose sum is σ = 262752000. Its totient is φ = 182250432.

The previous prime is 221231629. The next prime is 221231639. The reversal of 221231633 is 336132122.

It is not a de Polignac number, because 221231633 - 2² = 221231629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221231599 and 221231608.

It is not an unprimeable number, because it can be changed into a prime (221231639) 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, 44108 + ... + 48866.

It is an arithmetic number, because the mean of its divisors is an integer number (16422000).

Almost surely, 2^221231633 is an apocalyptic number.

It is an amenable number.

221231633 is a deficient number, since it is larger than the sum of its proper divisors (41520367).

221231633 is a wasteful number, since it uses less digits than its factorization.

221231633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024.

The product of its digits is 1296, while the sum is 23.

The square root of 221231633 is about 14873.8573678787. The cubic root of 221231633 is about 604.8055136080.

Adding to 221231633 its reverse (336132122), we get a palindrome (557363755).

The spelling of 221231633 in words is "two hundred twenty-one million, two hundred thirty-one thousand, six hundred thirty-three".