21111023101020 has 48 divisors (see below), whose sum is σ = 59111902942848. Its totient is φ = 5629507278400.

The previous prime is 21111023100991. The next prime is 21111023101067. The reversal of 21111023101020 is 2010132011112.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 386695 + ... + 6509345.

It is an arithmetic number, because the mean of its divisors is an integer number (1231497977976).

Almost surely, 2^{21111023101020} is an apocalyptic number.

21111023101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111023101020 is an abundant number, since it is smaller than the sum of its proper divisors (38000879841828).

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

21111023101020 is a wasteful number, since it uses less digits than its factorization.

21111023101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180130 (or 6180128 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21111023101020 its reverse (2010132011112), we get a palindrome (23121155112132).

The spelling of 21111023101020 in words is "twenty-one trillion, one hundred eleven billion, twenty-three million, one hundred one thousand, twenty".