1021111021220 has 48 divisors (see below), whose sum is σ = 2160969148800. Its totient is φ = 405276418560.

The previous prime is 1021111021193. The next prime is 1021111021243. The reversal of 1021111021220 is 221201111201.

It is a junction number, because it is equal to n+sod(n) for n = 1021111021195 and 1021111021204.

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, 26938241 + ... + 26976119.

It is an arithmetic number, because the mean of its divisors is an integer number (45020190600).

Almost surely, 2^{1021111021220} is an apocalyptic number.

1021111021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021111021220 is an abundant number, since it is smaller than the sum of its proper divisors (1139858127580).

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

1021111021220 is a wasteful number, since it uses less digits than its factorization.

1021111021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48308 (or 48306 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021111021220 its reverse (221201111201), we get a palindrome (1242312132421).

The spelling of 1021111021220 in words is "one trillion, twenty-one billion, one hundred eleven million, twenty-one thousand, two hundred twenty".