201221221012210 has 128 divisors (see below), whose sum is σ = 437036109120000. Its totient is φ = 65162793738240.

The previous prime is 201221221012193. The next prime is 201221221012213. The reversal of 201221221012210 is 12210122122102.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (201221221012213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3014561916 + ... + 3014628664.

It is an arithmetic number, because the mean of its divisors is an integer number (3414344602500).

Almost surely, 2^{201221221012210} is an apocalyptic number.

201221221012210 is an abundant number, since it is smaller than the sum of its proper divisors (235814888107790).

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

201221221012210 is a wasteful number, since it uses less digits than its factorization.

201221221012210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73556.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201221221012210 its reverse (12210122122102), we get a palindrome (213431343134312).

The spelling of 201221221012210 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twenty-one million, twelve thousand, two hundred ten".