221221222010210 has 32 divisors (see below), whose sum is σ = 406599341699952. Its totient is φ = 86639264271360.

The previous prime is 221221222010039. The next prime is 221221222010221. The reversal of 221221222010210 is 12010222122122.

It can be written as a sum of positive squares in 8 ways, for example, as 146197093257601 + 75024128752609 = 12091199^2 + 8661647^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1105895501 + ... + 1106095520.

Almost surely, 2^{221221222010210} is an apocalyptic number.

221221222010210 is a deficient number, since it is larger than the sum of its proper divisors (185378119689742).

221221222010210 is a wasteful number, since it uses less digits than its factorization.

221221222010210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211991238.

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

Adding to 221221222010210 its reverse (12010222122122), we get a palindrome (233231444132332).

The spelling of 221221222010210 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, ten thousand, two hundred ten".