21121111102220 has 12 divisors (see below), whose sum is σ = 44354333314704. Its totient is φ = 8448444440880.

The previous prime is 21121111102171. The next prime is 21121111102241. The reversal of 21121111102220 is 2220111112112.

It is a super-2 number, since 2×21121111102220² (a number of 27 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 528027777536 + ... + 528027777575.

It is an arithmetic number, because the mean of its divisors is an integer number (3696194442892).

Almost surely, 2^{21121111102220} is an apocalyptic number.

21121111102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121111102220 is an abundant number, since it is smaller than the sum of its proper divisors (23233222212484).

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

21121111102220 is a wasteful number, since it uses less digits than its factorization.

21121111102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056055555120 (or 1056055555118 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121111102220 its reverse (2220111112112), we get a palindrome (23341222214332).

The spelling of 21121111102220 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred two thousand, two hundred twenty".