1011100221020 has 24 divisors (see below), whose sum is σ = 2168487284544. Its totient is φ = 395834979776.

The previous prime is 1011100221017. The next prime is 1011100221023. The reversal of 1011100221020 is 201220011101.

It is an interprime number because it is at equal distance from previous prime (1011100221017) and next prime (1011100221023).

It is a junction number, because it is equal to n+sod(n) for n = 1011100220992 and 1011100221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011100221023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537818327 + ... + 537820206.

It is an arithmetic number, because the mean of its divisors is an integer number (90353636856).

Almost surely, 2^{1011100221020} is an apocalyptic number.

1011100221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011100221020 is an abundant number, since it is smaller than the sum of its proper divisors (1157387063524).

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

1011100221020 is a wasteful number, since it uses less digits than its factorization.

1011100221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075638589 (or 1075638587 counting only the distinct ones).

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

Adding to 1011100221020 its reverse (201220011101), we get a palindrome (1212320232121).

The spelling of 1011100221020 in words is "one trillion, eleven billion, one hundred million, two hundred twenty-one thousand, twenty".