21022100122020 has 24 divisors (see below), whose sum is σ = 58861880341824. Its totient is φ = 5605893365856.

The previous prime is 21022100122019. The next prime is 21022100122027. The reversal of 21022100122020 is 2022100122012.

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

It is not an unprimeable number, because it can be changed into a prime (21022100122027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175184167624 + ... + 175184167743.

It is an arithmetic number, because the mean of its divisors is an integer number (2452578347576).

Almost surely, 2^{21022100122020} is an apocalyptic number.

21022100122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022100122020 is an abundant number, since it is smaller than the sum of its proper divisors (37839780219804).

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

21022100122020 is a wasteful number, since it uses less digits than its factorization.

21022100122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350368335379 (or 350368335377 counting only the distinct ones).

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

Adding to 21022100122020 its reverse (2022100122012), we get a palindrome (23044200244032).

The spelling of 21022100122020 in words is "twenty-one trillion, twenty-two billion, one hundred million, one hundred twenty-two thousand, twenty".