21120201001020 has 384 divisors, whose sum is σ = 69063702478848. Its totient is φ = 4770997862400.

The previous prime is 21120201001019. The next prime is 21120201001057. The reversal of 21120201001020 is 2010010202112.

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 = 21120201000987 and 21120201001005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 249957180 + ... + 250041660.

It is an arithmetic number, because the mean of its divisors is an integer number (179853391872).

Almost surely, 2^{21120201001020} is an apocalyptic number.

21120201001020 is a gapful number since it is divisible by the number (20) 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 21120201001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34531851239424).

21120201001020 is an abundant number, since it is smaller than the sum of its proper divisors (47943501477828).

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

21120201001020 is a wasteful number, since it uses less digits than its factorization.

21120201001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84953 (or 84951 counting only the distinct ones).

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

Adding to 21120201001020 its reverse (2010010202112), we get a palindrome (23130211203132).

The spelling of 21120201001020 in words is "twenty-one trillion, one hundred twenty billion, two hundred one million, one thousand, twenty".