21111122001100 has 36 divisors (see below), whose sum is σ = 45811367961184. Its totient is φ = 8444405810880.

The previous prime is 21111122001043. The next prime is 21111122001107. The reversal of 21111122001100 is 110022111112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21111122001107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25462282 + ... + 26278318.

Almost surely, 2^{21111122001100} is an apocalyptic number.

21111122001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111122001100 is an abundant number, since it is smaller than the sum of its proper divisors (24700245960084).

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

21111122001100 is a wasteful number, since it uses less digits than its factorization.

21111122001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074754 (or 1074747 counting only the distinct ones).

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

Adding to 21111122001100 its reverse (110022111112), we get a palindrome (21221144112212).

The spelling of 21111122001100 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, one thousand, one hundred".