21030121203020 has 48 divisors (see below), whose sum is σ = 44232763085280. Its totient is φ = 8398810205184.

The previous prime is 21030121203017. The next prime is 21030121203041. The reversal of 21030121203020 is 2030212103012.

It is a super-2 number, since 2×21030121203020² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21030121203020.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320465252 + ... + 320530868.

It is an arithmetic number, because the mean of its divisors is an integer number (921515897610).

Almost surely, 2^{21030121203020} is an apocalyptic number.

21030121203020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030121203020 is an abundant number, since it is smaller than the sum of its proper divisors (23202641882260).

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

21030121203020 is a wasteful number, since it uses less digits than its factorization.

21030121203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90602 (or 90600 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21030121203020 its reverse (2030212103012), we get a palindrome (23060333306032).

The spelling of 21030121203020 in words is "twenty-one trillion, thirty billion, one hundred twenty-one million, two hundred three thousand, twenty".