21021100111000 has 64 divisors (see below), whose sum is σ = 53661135584160. Its totient is φ = 7644036400000.

The previous prime is 21021100110977. The next prime is 21021100111003. The reversal of 21021100111000 is 11100112012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021100111003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955493551 + ... + 955515550.

Almost surely, 2^{21021100111000} is an apocalyptic number.

21021100111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021100111000 is an abundant number, since it is smaller than the sum of its proper divisors (32640035473160).

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

21021100111000 is a wasteful number, since it uses less digits than its factorization.

21021100111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911009133 (or 1911009119 counting only the distinct ones).

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

Adding to 21021100111000 its reverse (11100112012), we get a palindrome (21032200223012).

The spelling of 21021100111000 in words is "twenty-one trillion, twenty-one billion, one hundred million, one hundred eleven thousand".