1210221112221 has 48 divisors (see below), whose sum is σ = 1990201674240. Its totient is φ = 701481248160.

The previous prime is 1210221112193. The next prime is 1210221112229. The reversal of 1210221112221 is 1222111220121.

1210221112221 is a `hidden beast` number, since 1 + 210 + 221 + 1 + 12 + 221 = 666.

It is not a de Polignac number, because 1210221112221 - 2⁵ = 1210221112189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210221112194 and 1210221112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210221112229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18682330 + ... + 18746996.

It is an arithmetic number, because the mean of its divisors is an integer number (41462534880).

Almost surely, 2^{1210221112221} is an apocalyptic number.

1210221112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210221112221 is a deficient number, since it is larger than the sum of its proper divisors (779980562019).

1210221112221 is a wasteful number, since it uses less digits than its factorization.

1210221112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72926 (or 72923 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1210221112221 its reverse (1222111220121), we get a palindrome (2432332332342).

The spelling of 1210221112221 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".