1021222111 has 16 divisors (see below), whose sum is σ = 1269857344. Its totient is φ = 799663104.

The previous prime is 1021222087. The next prime is 1021222133. The reversal of 1021222111 is 1112221201.

It is a cyclic number.

It is not a de Polignac number, because 1021222111 - 2⁷ = 1021221983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1021222091 and 1021222100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222141) 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, 49020 + ... + 66673.

It is an arithmetic number, because the mean of its divisors is an integer number (79366084).

Almost surely, 2^1021222111 is an apocalyptic number.

1021222111 is a deficient number, since it is larger than the sum of its proper divisors (248635233).

1021222111 is a wasteful number, since it uses less digits than its factorization.

1021222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115810.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1021222111 is about 31956.5660076298. The cubic root of 1021222111 is about 1007.0245767792.

Adding to 1021222111 its reverse (1112221201), we get a palindrome (2133443312).

It can be divided in two parts, 10212 and 22111, that added together give a palindrome (32323).

The spelling of 1021222111 in words is "one billion, twenty-one million, two hundred twenty-two thousand, one hundred eleven".