21110101202220 has 24 divisors (see below), whose sum is σ = 59108283366384. Its totient is φ = 5629360320576.

The previous prime is 21110101202189. The next prime is 21110101202221. The reversal of 21110101202220 is 2220210101112.

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 21110101202220.

It is not an unprimeable number, because it can be changed into a prime (21110101202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175917509959 + ... + 175917510078.

It is an arithmetic number, because the mean of its divisors is an integer number (2462845140266).

Almost surely, 2^{21110101202220} is an apocalyptic number.

21110101202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110101202220 is an abundant number, since it is smaller than the sum of its proper divisors (37998182164164).

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

21110101202220 is a wasteful number, since it uses less digits than its factorization.

21110101202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351835020049 (or 351835020047 counting only the distinct ones).

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

Adding to 21110101202220 its reverse (2220210101112), we get a palindrome (23330311303332).

The spelling of 21110101202220 in words is "twenty-one trillion, one hundred ten billion, one hundred one million, two hundred two thousand, two hundred twenty".