21220021111100 has 144 divisors (see below), whose sum is σ = 55186091822400. Its totient is φ = 6928331397120.

The previous prime is 21220021111097. The next prime is 21220021111103. The reversal of 21220021111100 is 111112002212.

It is an interprime number because it is at equal distance from previous prime (21220021111097) and next prime (21220021111103).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220021111103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5677835 + ... + 8641634.

Almost surely, 2^{21220021111100} is an apocalyptic number.

21220021111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220021111100 is an abundant number, since it is smaller than the sum of its proper divisors (33966070711300).

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

21220021111100 is a wasteful number, since it uses less digits than its factorization.

21220021111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14319592 (or 14319585 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21220021111100 its reverse (111112002212), we get a palindrome (21331133113312).

The spelling of 21220021111100 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, one hundred eleven thousand, one hundred".