1021222221020 has 12 divisors (see below), whose sum is σ = 2144566664184. Its totient is φ = 408488888400.

The previous prime is 1021222220969. The next prime is 1021222221043. The reversal of 1021222221020 is 201222221201.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021222221020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25530555506 + ... + 25530555545.

It is an arithmetic number, because the mean of its divisors is an integer number (178713888682).

Almost surely, 2^{1021222221020} is an apocalyptic number.

1021222221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021222221020 is an abundant number, since it is smaller than the sum of its proper divisors (1123344443164).

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

1021222221020 is a wasteful number, since it uses less digits than its factorization.

1021222221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51061111060 (or 51061111058 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1021222221020 its reverse (201222221201), we get a palindrome (1222444442221).

The spelling of 1021222221020 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty".