21011221101100 has 36 divisors (see below), whose sum is σ = 45594564400000. Its totient is φ = 8404448880960.

The previous prime is 21011221101041. The next prime is 21011221101119. The reversal of 21011221101100 is 110112211012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30558901 + ... + 31238899.

Almost surely, 2^{21011221101100} is an apocalyptic number.

21011221101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011221101100 is an abundant number, since it is smaller than the sum of its proper divisors (24583343298900).

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

21011221101100 is a wasteful number, since it uses less digits than its factorization.

21011221101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989002 (or 988995 counting only the distinct ones).

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

Adding to 21011221101100 its reverse (110112211012), we get a palindrome (21121333312112).

The spelling of 21011221101100 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred one thousand, one hundred".