221221002021222 has 32 divisors (see below), whose sum is σ = 506042118542592. Its totient is φ = 63156736337184.

The previous prime is 221221002021197. The next prime is 221221002021311. The reversal of 221221002021222 is 222120200122122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 2052622153 + ... + 2052729924.

It is an arithmetic number, because the mean of its divisors is an integer number (15813816204456).

Almost surely, 2^{221221002021222} is an apocalyptic number.

221221002021222 is an abundant number, since it is smaller than the sum of its proper divisors (284821116521370).

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

221221002021222 is a wasteful number, since it uses less digits than its factorization.

221221002021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105353372.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221221002021222 its reverse (222120200122122), we get a palindrome (443341202143344).

The spelling of 221221002021222 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two million, twenty-one thousand, two hundred twenty-two".