1011221001020 has 24 divisors (see below), whose sum is σ = 2128491183168. Its totient is φ = 403549908800.

The previous prime is 1011221000921. The next prime is 1011221001023. The reversal of 1011221001020 is 201001221101.

It is a junction number, because it is equal to n+sod(n) for n = 1011221000992 and 1011221001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221001023) 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, 58646891 + ... + 58664130.

It is an arithmetic number, because the mean of its divisors is an integer number (88687132632).

Almost surely, 2^{1011221001020} is an apocalyptic number.

1011221001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011221001020 is an abundant number, since it is smaller than the sum of its proper divisors (1117270182148).

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

1011221001020 is a wasteful number, since it uses less digits than its factorization.

1011221001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117311461 (or 117311459 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1011221001020 its reverse (201001221101), we get a palindrome (1212222222121).

The spelling of 1011221001020 in words is "one trillion, eleven billion, two hundred twenty-one million, one thousand, twenty".