21220211222200 has 24 divisors (see below), whose sum is σ = 49336991092080. Its totient is φ = 8488084488800.

The previous prime is 21220211222173. The next prime is 21220211222219. The reversal of 21220211222200 is 222211202212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53050527856 + ... + 53050528255.

It is an arithmetic number, because the mean of its divisors is an integer number (2055707962170).

Almost surely, 2^{21220211222200} is an apocalyptic number.

21220211222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220211222200 is an abundant number, since it is smaller than the sum of its proper divisors (28116779869880).

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

21220211222200 is a wasteful number, since it uses less digits than its factorization.

21220211222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106101056127 (or 106101056118 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21220211222200 its reverse (222211202212), we get a palindrome (21442422424412).

The spelling of 21220211222200 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, two hundred twenty-two thousand, two hundred".