21000111011000 has 128 divisors (see below), whose sum is σ = 55456093368000. Its totient is φ = 7373079616000.

The previous prime is 21000111010981. The next prime is 21000111011041. The reversal of 21000111011000 is 11011100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (8).

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 31 ways as a sum of consecutive naturals, for example, 32596535 + ... + 33234534.

Almost surely, 2^{21000111011000} is an apocalyptic number.

21000111011000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000111011000 is an abundant number, since it is smaller than the sum of its proper divisors (34455982357000).

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

21000111011000 is a wasteful number, since it uses less digits than its factorization.

21000111011000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65831130 (or 65831116 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21000111011000 its reverse (11011100012), we get a palindrome (21011122111012).

The spelling of 21000111011000 in words is "twenty-one trillion, one hundred eleven million, eleven thousand".