221226536 has 8 divisors (see below), whose sum is σ = 414799770. Its totient is φ = 110613264.

The previous prime is 221226521. The next prime is 221226539. The reversal of 221226536 is 635622122.

221226536 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 204661636 + 16564900 = 14306^2 + 4070^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 221226499 and 221226508.

It is not an unprimeable number, because it can be changed into a prime (221226539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13826651 + ... + 13826666.

Almost surely, 2^221226536 is an apocalyptic number.

It is an amenable number.

221226536 is a deficient number, since it is larger than the sum of its proper divisors (193573234).

221226536 is a wasteful number, since it uses less digits than its factorization.

221226536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27653323 (or 27653319 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 221226536 is about 14873.6860259991. The cubic root of 221226536 is about 604.8008688271.

Adding to 221226536 its reverse (635622122), we get a palindrome (856848658).

The spelling of 221226536 in words is "two hundred twenty-one million, two hundred twenty-six thousand, five hundred thirty-six".