1012221221020 has 24 divisors (see below), whose sum is σ = 2126585260800. Its totient is φ = 404713117632.

The previous prime is 1012221220993. The next prime is 1012221221021. The reversal of 1012221221020 is 201221222101.

It is a happy number.

1012221221020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1012221220985 and 1012221221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012221221021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10913340 + ... + 11005699.

It is an arithmetic number, because the mean of its divisors is an integer number (88607719200).

Almost surely, 2^{1012221221020} is an apocalyptic number.

1012221221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012221221020 is an abundant number, since it is smaller than the sum of its proper divisors (1114364039780).

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

1012221221020 is a wasteful number, since it uses less digits than its factorization.

1012221221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21921357 (or 21921355 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1012221221020 its reverse (201221222101), we get a palindrome (1213442443121).

The spelling of 1012221221020 in words is "one trillion, twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty".