21111010220120 has 128 divisors (see below), whose sum is σ = 47855872880640. Its totient is φ = 8381323484160.

The previous prime is 21111010220089. The next prime is 21111010220129. The reversal of 21111010220120 is 2102201011112.

It is a super-2 number, since 2×21111010220120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111010220095 and 21111010220104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111010220129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9411951719 + ... + 9411953961.

It is an arithmetic number, because the mean of its divisors is an integer number (373874006880).

Almost surely, 2^{21111010220120} is an apocalyptic number.

21111010220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111010220120 is an abundant number, since it is smaller than the sum of its proper divisors (26744862660520).

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

21111010220120 is a wasteful number, since it uses less digits than its factorization.

21111010220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4665 (or 4661 counting only the distinct ones).

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

Adding to 21111010220120 its reverse (2102201011112), we get a palindrome (23213211231232).

The spelling of 21111010220120 in words is "twenty-one trillion, one hundred eleven billion, ten million, two hundred twenty thousand, one hundred twenty".