21011121303020 has 48 divisors (see below), whose sum is σ = 44170946023680. Its totient is φ = 8395388015616.

The previous prime is 21011121303001. The next prime is 21011121303037. The reversal of 21011121303020 is 2030312111012.

It is a super-2 number, since 2×21011121303020² (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 21011121303020.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 75639104 + ... + 75916376.

It is an arithmetic number, because the mean of its divisors is an integer number (920228042160).

Almost surely, 2^{21011121303020} is an apocalyptic number.

21011121303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011121303020 is an abundant number, since it is smaller than the sum of its proper divisors (23159824720660).

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

21011121303020 is a wasteful number, since it uses less digits than its factorization.

21011121303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281354 (or 281352 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21011121303020 its reverse (2030312111012), we get a palindrome (23041433414032).

The spelling of 21011121303020 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, three hundred three thousand, twenty".