21000011111020 has 12 divisors (see below), whose sum is σ = 44100023333184. Its totient is φ = 8400004444400.

The previous prime is 21000011110993. The next prime is 21000011111069. The reversal of 21000011111020 is 2011111000012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21000011110988 and 21000011111006.

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 3 ways as a sum of consecutive naturals, for example, 525000277756 + ... + 525000277795.

It is an arithmetic number, because the mean of its divisors is an integer number (3675001944432).

Almost surely, 2^{21000011111020} is an apocalyptic number.

21000011111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000011111020 is an abundant number, since it is smaller than the sum of its proper divisors (23100012222164).

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

21000011111020 is a wasteful number, since it uses less digits than its factorization.

21000011111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050000555560 (or 1050000555558 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21000011111020 its reverse (2011111000012), we get a palindrome (23011122111032).

The spelling of 21000011111020 in words is "twenty-one trillion, eleven million, one hundred eleven thousand, twenty".