21011200000220 has 24 divisors (see below), whose sum is σ = 44256823700208. Its totient is φ = 8379088819200.

The previous prime is 21011200000169. The next prime is 21011200000237. The reversal of 21011200000220 is 2200000211012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 1586942021 + ... + 1586955260.

It is an arithmetic number, because the mean of its divisors is an integer number (1844034320842).

Almost surely, 2^{21011200000220} is an apocalyptic number.

21011200000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011200000220 is an abundant number, since it is smaller than the sum of its proper divisors (23245623699988).

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

21011200000220 is a wasteful number, since it uses less digits than its factorization.

21011200000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173897621 (or 3173897619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21011200000220 its reverse (2200000211012), we get a palindrome (23211200211232).

The spelling of 21011200000220 in words is "twenty-one trillion, eleven billion, two hundred million, two hundred twenty", and thus it is an aban number.