21220120021100 has 216 divisors, whose sum is σ = 62930271298608. Its totient is φ = 6105289075200.

The previous prime is 21220120021031. The next prime is 21220120021183. The reversal of 21220120021100 is 112002102212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14441387 + ... + 15842786.

Almost surely, 2^{21220120021100} is an apocalyptic number.

21220120021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220120021100 is an abundant number, since it is smaller than the sum of its proper divisors (41710151277508).

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

21220120021100 is a wasteful number, since it uses less digits than its factorization.

21220120021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30284225 (or 30284211 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220120021100 its reverse (112002102212), we get a palindrome (21332122123312).

The spelling of 21220120021100 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, twenty-one thousand, one hundred".