221221001210 has 64 divisors (see below), whose sum is σ = 457409358720. Its totient is φ = 76185319680.

The previous prime is 221221001147. The next prime is 221221001213. The reversal of 221221001210 is 12100122122.

It is not an unprimeable number, because it can be changed into a prime (221221001213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7117664 + ... + 7148676.

It is an arithmetic number, because the mean of its divisors is an integer number (7147021230).

Almost surely, 2^221221001210 is an apocalyptic number.

221221001210 is an abundant number, since it is smaller than the sum of its proper divisors (236188357510).

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

221221001210 is a wasteful number, since it uses less digits than its factorization.

221221001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34463.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221221001210 its reverse (12100122122), we get a palindrome (233321123332).

The spelling of 221221001210 in words is "two hundred twenty-one billion, two hundred twenty-one million, one thousand, two hundred ten".