1011221222020 has 144 divisors (see below), whose sum is σ = 2348075616768. Its totient is φ = 365298024960.

The previous prime is 1011221221991. The next prime is 1011221222023. The reversal of 1011221222020 is 202221221101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1011221221985 and 1011221222003.

It is not an unprimeable number, because it can be changed into a prime (1011221222023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14962224 + ... + 15029656.

It is an arithmetic number, because the mean of its divisors is an integer number (16306080672).

Almost surely, 2^{1011221222020} is an apocalyptic number.

1011221222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011221222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1174037808384).

1011221222020 is an abundant number, since it is smaller than the sum of its proper divisors (1336854394748).

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

1011221222020 is a wasteful number, since it uses less digits than its factorization.

1011221222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67578 (or 67557 counting only the distinct ones).

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

Adding to 1011221222020 its reverse (202221221101), we get a palindrome (1213442443121).

The spelling of 1011221222020 in words is "one trillion, eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty".