21201220220110 has 32 divisors (see below), whose sum is σ = 43614143128512. Its totient is φ = 7268955724800.

The previous prime is 21201220220051. The next prime is 21201220220227. The reversal of 21201220220110 is 1102202210212.

It is a happy number.

It is a super-2 number, since 2×21201220220110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17733184 + ... + 18890956.

It is an arithmetic number, because the mean of its divisors is an integer number (1362941972766).

Almost surely, 2^{21201220220110} is an apocalyptic number.

21201220220110 is an abundant number, since it is smaller than the sum of its proper divisors (22412922908402).

21201220220110 is a wasteful number, since it uses less digits than its factorization.

21201220220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419388.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21201220220110 its reverse (1102202210212), we get a palindrome (22303422430322).

The spelling of 21201220220110 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred twenty thousand, one hundred ten".