21111120201020 has 48 divisors (see below), whose sum is σ = 46942195845888. Its totient is φ = 7947546670080.

The previous prime is 21111120200999. The next prime is 21111120201049. The reversal of 21111120201020 is 2010202111112.

It is a super-2 number, since 2×21111120201020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111120200986 and 21111120201004.

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 15 ways as a sum of consecutive naturals, for example, 15949109 + ... + 17221971.

It is an arithmetic number, because the mean of its divisors is an integer number (977962413456).

Almost surely, 2^{21111120201020} is an apocalyptic number.

21111120201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111120201020 is an abundant number, since it is smaller than the sum of its proper divisors (25831075644868).

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

21111120201020 is a wasteful number, since it uses less digits than its factorization.

21111120201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321670 (or 1321668 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111120201020 its reverse (2010202111112), we get a palindrome (23121322312132).

The spelling of 21111120201020 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, two hundred one thousand, twenty".