21112020221100 has 36 divisors (see below), whose sum is σ = 61084111840584. Its totient is φ = 5629872058880.

The previous prime is 21112020221099. The next prime is 21112020221161. The reversal of 21112020221100 is 112202021112.

It is a super-2 number, since 2×21112020221100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21112020221100.

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, 35186700069 + ... + 35186700668.

Almost surely, 2^{21112020221100} is an apocalyptic number.

21112020221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112020221100 is an abundant number, since it is smaller than the sum of its proper divisors (39972091619484).

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

21112020221100 is a wasteful number, since it uses less digits than its factorization.

21112020221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70373400754 (or 70373400747 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112020221100 its reverse (112202021112), we get a palindrome (21224222242212).

The spelling of 21112020221100 in words is "twenty-one trillion, one hundred twelve billion, twenty million, two hundred twenty-one thousand, one hundred".