21022100120220 has 48 divisors (see below), whose sum is σ = 58872220636320. Its totient is φ = 5604908574976.

The previous prime is 21022100120143. The next prime is 21022100120221. The reversal of 21022100120220 is 2202100122012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21022100120220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022100120221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30430275 + ... + 31113434.

It is an arithmetic number, because the mean of its divisors is an integer number (1226504596590).

Almost surely, 2^{21022100120220} is an apocalyptic number.

21022100120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022100120220 is an abundant number, since it is smaller than the sum of its proper divisors (37850120516100).

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

21022100120220 is a wasteful number, since it uses less digits than its factorization.

21022100120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61549414 (or 61549412 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022100120220 its reverse (2202100122012), we get a palindrome (23224200242232).

The spelling of 21022100120220 in words is "twenty-one trillion, twenty-two billion, one hundred million, one hundred twenty thousand, two hundred twenty".