221020311232 has 28 divisors (see below), whose sum is σ = 501242492560. Its totient is φ = 94722990336.

The previous prime is 221020311223. The next prime is 221020311257. The reversal of 221020311232 is 232113020122.

It is a tau number, because it is divible by the number of its divisors (28).

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, 246674007 + ... + 246674902.

Almost surely, 2^221020311232 is an apocalyptic number.

It is an amenable number.

221020311232 is an abundant number, since it is smaller than the sum of its proper divisors (280222181328).

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

221020311232 is an equidigital number, since it uses as much as digits as its factorization.

221020311232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493348928 (or 493348918 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221020311232 its reverse (232113020122), we get a palindrome (453133331354).

The spelling of 221020311232 in words is "two hundred twenty-one billion, twenty million, three hundred eleven thousand, two hundred thirty-two".