21111010010220 has 96 divisors (see below), whose sum is σ = 63663407656128. Its totient is φ = 5196099750912.

The previous prime is 21111010010219. The next prime is 21111010010221. The reversal of 21111010010220 is 2201001011112.

It is an interprime number because it is at equal distance from previous prime (21111010010219) and next prime (21111010010221).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21111010010196 and 21111010010205.

It is not an unprimeable number, because it can be changed into a prime (21111010010221) 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, 7737622 + ... + 10104098.

It is an arithmetic number, because the mean of its divisors is an integer number (663160496418).

Almost surely, 2^{21111010010220} is an apocalyptic number.

21111010010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111010010220 is an abundant number, since it is smaller than the sum of its proper divisors (42552397645908).

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

21111010010220 is a wasteful number, since it uses less digits than its factorization.

21111010010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377939 (or 2377937 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111010010220 its reverse (2201001011112), we get a palindrome (23312011021332).

The spelling of 21111010010220 in words is "twenty-one trillion, one hundred eleven billion, ten million, ten thousand, two hundred twenty".