1021221202120 has 64 divisors (see below), whose sum is σ = 2627830926720. Its totient is φ = 349888510464.

The previous prime is 1021221202103. The next prime is 1021221202139. The reversal of 1021221202120 is 212021221201.

It is a happy number.

1021221202120 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 = 1021221202094 and 1021221202103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871342 + ... + 1673821.

It is an arithmetic number, because the mean of its divisors is an integer number (41059858230).

Almost surely, 2^{1021221202120} is an apocalyptic number.

1021221202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021221202120 is an abundant number, since it is smaller than the sum of its proper divisors (1606609724600).

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

1021221202120 is a wasteful number, since it uses less digits than its factorization.

1021221202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546614 (or 2546610 counting only the distinct ones).

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

Adding to 1021221202120 its reverse (212021221201), we get a palindrome (1233242423321).

The spelling of 1021221202120 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty".