221230676 has 18 divisors (see below), whose sum is σ = 400794030. Its totient is φ = 106723680.

The previous prime is 221230649. The next prime is 221230679. The reversal of 221230676 is 676032122.

It can be written as a sum of positive squares in 3 ways, for example, as 27352900 + 193877776 = 5230^2 + 13924^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159506 + ... + 160886.

It is an arithmetic number, because the mean of its divisors is an integer number (22266335).

Almost surely, 2^221230676 is an apocalyptic number.

It is an amenable number.

221230676 is a deficient number, since it is larger than the sum of its proper divisors (179563354).

221230676 is an equidigital number, since it uses as much as digits as its factorization.

221230676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795 (or 1412 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 221230676 is about 14873.8251973055. The cubic root of 221230676 is about 604.8046415209.

Multiplying 221230676 by its sum of digits (29), we get a square (6415689604 = 80098²).

221230676 divided by its sum of digits (29) gives a square (7628644 = 2762²).

Adding to 221230676 its reverse (676032122), we get a palindrome (897262798).

The spelling of 221230676 in words is "two hundred twenty-one million, two hundred thirty thousand, six hundred seventy-six".