1011021200020 has 48 divisors (see below), whose sum is σ = 2291744100240. Its totient is φ = 372437968896.

The previous prime is 1011021200009. The next prime is 1011021200027. The reversal of 1011021200020 is 200021201101.

It can be written as a sum of positive squares in 8 ways, for example, as 60887536516 + 950133663504 = 246754^2 + 974748^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011021200027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4377655 + ... + 4602814.

It is an arithmetic number, because the mean of its divisors is an integer number (47744668755).

Almost surely, 2^{1011021200020} is an apocalyptic number.

1011021200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011021200020 is an abundant number, since it is smaller than the sum of its proper divisors (1280722900220).

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

1011021200020 is a wasteful number, since it uses less digits than its factorization.

1011021200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8980924 (or 8980922 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1011021200020 its reverse (200021201101), we get a palindrome (1211042401121).

The spelling of 1011021200020 in words is "one trillion, eleven billion, twenty-one million, two hundred thousand, twenty".