221321321131210 has 16 divisors (see below), whose sum is σ = 398381090941800. Its totient is φ = 88527925584576.

The previous prime is 221321321131123. The next prime is 221321321131217. The reversal of 221321321131210 is 12131123123122.

It can be written as a sum of positive squares in 4 ways, for example, as 204054911078841 + 17266410052369 = 14284779^2 + 4155287^2 .

It is not an unprimeable number, because it can be changed into a prime (221321321131217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73815105 + ... + 76754884.

Almost surely, 2^{221321321131210} is an apocalyptic number.

221321321131210 is a deficient number, since it is larger than the sum of its proper divisors (177059769810590).

221321321131210 is a wasteful number, since it uses less digits than its factorization.

221321321131210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150716985.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 221321321131210 its reverse (12131123123122), we get a palindrome (233452444254332).

The spelling of 221321321131210 in words is "two hundred twenty-one trillion, three hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred ten".