21020120220220 has 36 divisors (see below), whose sum is σ = 48519996513912. Its totient is φ = 7643680079200.

The previous prime is 21020120220217. The next prime is 21020120220277. The reversal of 21020120220220 is 2202202102012.

It is a junction number, because it is equal to n+sod(n) for n = 21020120220194 and 21020120220203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4342997626 + ... + 4343002465.

It is an arithmetic number, because the mean of its divisors is an integer number (1347777680942).

Almost surely, 2^{21020120220220} is an apocalyptic number.

21020120220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020120220220 is an abundant number, since it is smaller than the sum of its proper divisors (27499876293692).

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

21020120220220 is a wasteful number, since it uses less digits than its factorization.

21020120220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8686000122 (or 8686000109 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020120220220 its reverse (2202202102012), we get a palindrome (23222322322232).

The spelling of 21020120220220 in words is "twenty-one trillion, twenty billion, one hundred twenty million, two hundred twenty thousand, two hundred twenty".