1021212221022 has 96 divisors (see below), whose sum is σ = 2621641464000. Its totient is φ = 281096815104.

The previous prime is 1021212220937. The next prime is 1021212221047. The reversal of 1021212221022 is 2201222121201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1021212220986 and 1021212221004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1364104 + ... + 1975652.

It is an arithmetic number, because the mean of its divisors is an integer number (27308765250).

Almost surely, 2^{1021212221022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021212221022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310820732000).

1021212221022 is an abundant number, since it is smaller than the sum of its proper divisors (1600429242978).

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

1021212221022 is a wasteful number, since it uses less digits than its factorization.

1021212221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612050 (or 612047 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1021212221022 its reverse (2201222121201), we get a palindrome (3222434342223).

The spelling of 1021212221022 in words is "one trillion, twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, twenty-two".