221235460 has 12 divisors (see below), whose sum is σ = 464594508. Its totient is φ = 88494176.

The previous prime is 221235419. The next prime is 221235463. The reversal of 221235460 is 64532122.

It can be written as a sum of positive squares in 2 ways, for example, as 66879684 + 154355776 = 8178^2 + 12424^2 .

It is a super-2 number, since 2×221235460² = 97890257522823200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221235463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5530867 + ... + 5530906.

It is an arithmetic number, because the mean of its divisors is an integer number (38716209).

Almost surely, 2^221235460 is an apocalyptic number.

221235460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221235460 is an abundant number, since it is smaller than the sum of its proper divisors (243359048).

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

221235460 is a wasteful number, since it uses less digits than its factorization.

221235460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11061782 (or 11061780 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 221235460 is about 14873.9860158600. The cubic root of 221235460 is about 604.8090010197.

Adding to 221235460 its reverse (64532122), we get a palindrome (285767582).

The spelling of 221235460 in words is "two hundred twenty-one million, two hundred thirty-five thousand, four hundred sixty".