21220122020100 has 144 divisors (see below), whose sum is σ = 61466509141632. Its totient is φ = 5652286115840.

The previous prime is 21220122020099. The next prime is 21220122020117. The reversal of 21220122020100 is 102022102212.

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 21220122020100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1085251924 + ... + 1085271476.

It is an arithmetic number, because the mean of its divisors is an integer number (426850757928).

Almost surely, 2^{21220122020100} is an apocalyptic number.

21220122020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220122020100 is an abundant number, since it is smaller than the sum of its proper divisors (40246387121532).

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

21220122020100 is a wasteful number, since it uses less digits than its factorization.

21220122020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23486 (or 23479 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220122020100 its reverse (102022102212), we get a palindrome (21322144122312).

The spelling of 21220122020100 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, twenty thousand, one hundred".