1021122222221 has 16 divisors (see below), whose sum is σ = 1043601919488. Its totient is φ = 998842665600.

The previous prime is 1021122222203. The next prime is 1021122222227. The reversal of 1021122222221 is 1222222211201.

It is a cyclic number.

It is not a de Polignac number, because 1021122222221 - 2⁶ = 1021122222157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021122222193 and 1021122222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021122222227) 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, 8167040 + ... + 8291126.

It is an arithmetic number, because the mean of its divisors is an integer number (65225119968).

Almost surely, 2^{1021122222221} is an apocalyptic number.

It is an amenable number.

1021122222221 is a deficient number, since it is larger than the sum of its proper divisors (22479697267).

1021122222221 is a wasteful number, since it uses less digits than its factorization.

1021122222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124892.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1021122222221 its reverse (1222222211201), we get a palindrome (2243344433422).

The spelling of 1021122222221 in words is "one trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".