21121111000220 has 96 divisors (see below), whose sum is σ = 55305044282880. Its totient is φ = 6582473015040.

The previous prime is 21121111000097. The next prime is 21121111000279. The reversal of 21121111000220 is 2200011112112.

It is a super-2 number, since 2×21121111000220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21121111000195 and 21121111000204.

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 31 ways as a sum of consecutive naturals, for example, 13206866 + ... + 14719494.

It is an arithmetic number, because the mean of its divisors is an integer number (576094211280).

Almost surely, 2^{21121111000220} is an apocalyptic number.

21121111000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121111000220 is an abundant number, since it is smaller than the sum of its proper divisors (34183933282660).

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

21121111000220 is a wasteful number, since it uses less digits than its factorization.

21121111000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521723 (or 1521721 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121111000220 its reverse (2200011112112), we get a palindrome (23321122112332).

The spelling of 21121111000220 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty", and thus it is an aban number.