1011021220020 has 96 divisors (see below), whose sum is σ = 3236629890816. Its totient is φ = 230993280000.

The previous prime is 1011021220009. The next prime is 1011021220037. The reversal of 1011021220020 is 200221201101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1011021219978 and 1011021220005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494520 + ... + 1505520.

It is an arithmetic number, because the mean of its divisors is an integer number (33714894696).

Almost surely, 2^{1011021220020} is an apocalyptic number.

1011021220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011021220020 is an abundant number, since it is smaller than the sum of its proper divisors (2225608670796).

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

1011021220020 is a wasteful number, since it uses less digits than its factorization.

1011021220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013401 (or 1013399 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1011021220020 its reverse (200221201101), we get a palindrome (1211242421121).

The spelling of 1011021220020 in words is "one trillion, eleven billion, twenty-one million, two hundred twenty thousand, twenty".