21021112101100 has 72 divisors (see below), whose sum is σ = 48379423081248. Its totient is φ = 7911010060800.

The previous prime is 21021112101091. The next prime is 21021112101179. The reversal of 21021112101100 is 110121112012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74774569 + ... + 75055168.

It is an arithmetic number, because the mean of its divisors is an integer number (671936431684).

Almost surely, 2^{21021112101100} is an apocalyptic number.

21021112101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021112101100 is an abundant number, since it is smaller than the sum of its proper divisors (27358310980148).

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

21021112101100 is a wasteful number, since it uses less digits than its factorization.

21021112101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149829835 (or 149829828 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21021112101100 its reverse (110121112012), we get a palindrome (21131233213112).

The spelling of 21021112101100 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred one thousand, one hundred".