221221133013210 has 128 divisors (see below), whose sum is σ = 600838468761600. Its totient is φ = 51635842110720.

The previous prime is 221221133013173. The next prime is 221221133013217. The reversal of 221221133013210 is 12310331122122.

It is not an unprimeable number, because it can be changed into a prime (221221133013217) 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, 28759504 + ... + 35630763.

It is an arithmetic number, because the mean of its divisors is an integer number (4694050537200).

Almost surely, 2^{221221133013210} is an apocalyptic number.

221221133013210 is an abundant number, since it is smaller than the sum of its proper divisors (379617335748390).

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

221221133013210 is a wasteful number, since it uses less digits than its factorization.

221221133013210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64390676.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 221221133013210 its reverse (12310331122122), we get a palindrome (233531464135332).

It can be divided in two parts, 2212211 and 33013210, that added together give a triangular number (35225421 = T₈₃₉₃).

The spelling of 221221133013210 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred thirty-three million, thirteen thousand, two hundred ten".