1021221022212 has 72 divisors (see below), whose sum is σ = 2763979054200. Its totient is φ = 316783239168.

The previous prime is 1021221022111. The next prime is 1021221022223. The reversal of 1021221022212 is 2122201221201.

It is a happy number.

1021221022212 is a `hidden beast` number, since 10 + 212 + 210 + 22 + 212 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21846276 + 1021199175936 = 4674^2 + 1010544^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9320037 + ... + 9428972.

It is an arithmetic number, because the mean of its divisors is an integer number (38388597975).

Almost surely, 2^{1021221022212} is an apocalyptic number.

1021221022212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021221022212 is an abundant number, since it is smaller than the sum of its proper divisors (1742758031988).

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

1021221022212 is a wasteful number, since it uses less digits than its factorization.

1021221022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18749125 (or 18749120 counting only the distinct ones).

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

Adding to 1021221022212 its reverse (2122201221201), we get a palindrome (3143422243413).

The spelling of 1021221022212 in words is "one trillion, twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred twelve".