21101200010220 has 96 divisors (see below), whose sum is σ = 64788536494080. Its totient is φ = 5088937512960.

The previous prime is 21101200010213. The next prime is 21101200010227. The reversal of 21101200010220 is 2201000210112.

It is an interprime number because it is at equal distance from previous prime (21101200010213) and next prime (21101200010227).

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 = 21101200010196 and 21101200010205.

It is not an unprimeable number, because it can be changed into a prime (21101200010227) 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, 82700380 + ... + 82955139.

It is an arithmetic number, because the mean of its divisors is an integer number (674880588480).

Almost surely, 2^{21101200010220} is an apocalyptic number.

21101200010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101200010220 is an abundant number, since it is smaller than the sum of its proper divisors (43687336483860).

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

21101200010220 is a wasteful number, since it uses less digits than its factorization.

21101200010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165655735 (or 165655733 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101200010220 its reverse (2201000210112), we get a palindrome (23302200220332).

The spelling of 21101200010220 in words is "twenty-one trillion, one hundred one billion, two hundred million, ten thousand, two hundred twenty".