21000021011120 has 20 divisors (see below), whose sum is σ = 48825048851040. Its totient is φ = 8400008404416.

The previous prime is 21000021011077. The next prime is 21000021011129. The reversal of 21000021011120 is 2111012000012.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (21000021011129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131250131240 + ... + 131250131399.

It is an arithmetic number, because the mean of its divisors is an integer number (2441252442552).

Almost surely, 2^{21000021011120} is an apocalyptic number.

21000021011120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000021011120 is an abundant number, since it is smaller than the sum of its proper divisors (27825027839920).

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

21000021011120 is a wasteful number, since it uses less digits than its factorization.

21000021011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262500262652 (or 262500262646 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000021011120 its reverse (2111012000012), we get a palindrome (23111033011132).

The spelling of 21000021011120 in words is "twenty-one trillion, twenty-one million, eleven thousand, one hundred twenty".