221020221221210 has 16 divisors (see below), whose sum is σ = 398859113881800. Its totient is φ = 88180818336576.

The previous prime is 221020221221179. The next prime is 221020221221221. The reversal of 221020221221210 is 12122122020122.

It can be written as a sum of positive squares in 4 ways, for example, as 94592527805161 + 126427693416049 = 9725869^2 + 11244007^2 .

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, 28408764905 + ... + 28408772684.

Almost surely, 2^{221020221221210} is an apocalyptic number.

221020221221210 is a deficient number, since it is larger than the sum of its proper divisors (177838892660590).

221020221221210 is a wasteful number, since it uses less digits than its factorization.

221020221221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56817537985.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221020221221210 its reverse (12122122020122), we get a palindrome (233142343241332).

The spelling of 221020221221210 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred ten".