1021112212221 has 16 divisors (see below), whose sum is σ = 1512775257600. Its totient is φ = 680734083744.

The previous prime is 1021112212157. The next prime is 1021112212271. The reversal of 1021112212221 is 1222122111201.

1021112212221 is a `hidden beast` number, since 10 + 211 + 1 + 221 + 2 + 221 = 666.

It is not a de Polignac number, because 1021112212221 - 2⁶ = 1021112212157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021112212194 and 1021112212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021112212271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3630585 + ... + 3901713.

It is an arithmetic number, because the mean of its divisors is an integer number (94548453600).

Almost surely, 2^{1021112212221} is an apocalyptic number.

It is an amenable number.

1021112212221 is a deficient number, since it is larger than the sum of its proper divisors (491663045379).

1021112212221 is a wasteful number, since it uses less digits than its factorization.

1021112212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410625 (or 410619 counting only the distinct ones).

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

Adding to 1021112212221 its reverse (1222122111201), we get a palindrome (2243234323422).

The spelling of 1021112212221 in words is "one trillion, twenty-one billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".