221321211332 has 24 divisors (see below), whose sum is σ = 431488306200. Its totient is φ = 98625897216.

The previous prime is 221321211329. The next prime is 221321211401. The reversal of 221321211332 is 233112123122.

It can be written as a sum of positive squares in 4 ways, for example, as 97732996 + 221223478336 = 9886^2 + 470344^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221321211298 and 221321211307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73380857 + ... + 73383872.

It is an arithmetic number, because the mean of its divisors is an integer number (17978679425).

Almost surely, 2^221321211332 is an apocalyptic number.

It is an amenable number.

221321211332 is a deficient number, since it is larger than the sum of its proper divisors (210167094868).

221321211332 is a wasteful number, since it uses less digits than its factorization.

221321211332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146764775 (or 146764773 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

Adding to 221321211332 its reverse (233112123122), we get a palindrome (454433334454).

The spelling of 221321211332 in words is "two hundred twenty-one billion, three hundred twenty-one million, two hundred eleven thousand, three hundred thirty-two".