21100201021220 has 48 divisors (see below), whose sum is σ = 45253906080768. Its totient is φ = 8260374810240.

The previous prime is 21100201021201. The next prime is 21100201021271. The reversal of 21100201021220 is 2212010200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100201021195 and 21100201021204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78629594 + ... + 78897486.

It is an arithmetic number, because the mean of its divisors is an integer number (942789710016).

Almost surely, 2^{21100201021220} is an apocalyptic number.

21100201021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100201021220 is an abundant number, since it is smaller than the sum of its proper divisors (24153705059548).

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

21100201021220 is a wasteful number, since it uses less digits than its factorization.

21100201021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351740 (or 351738 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21100201021220 its reverse (2212010200112), we get a palindrome (23312211221332).

The spelling of 21100201021220 in words is "twenty-one trillion, one hundred billion, two hundred one million, twenty-one thousand, two hundred twenty".