1020221121220 has 48 divisors (see below), whose sum is σ = 2472773603328. Its totient is φ = 346326825600.

The previous prime is 1020221121211. The next prime is 1020221121277. The reversal of 1020221121220 is 221211220201.

It is a happy number.

It is a super-2 number, since 2×1020221121220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020221121194 and 1020221121203.

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, 36061572 + ... + 36089851.

It is an arithmetic number, because the mean of its divisors is an integer number (51516116736).

Almost surely, 2^{1020221121220} is an apocalyptic number.

1020221121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020221121220 is an abundant number, since it is smaller than the sum of its proper divisors (1452552482108).

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

1020221121220 is a wasteful number, since it uses less digits than its factorization.

1020221121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72151540 (or 72151538 counting only the distinct ones).

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

Adding to 1020221121220 its reverse (221211220201), we get a palindrome (1241432341421).

The spelling of 1020221121220 in words is "one trillion, twenty billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".