21020222020220 has 48 divisors (see below), whose sum is σ = 44831185402080. Its totient is φ = 8277886865664.

The previous prime is 21020222020219. The next prime is 21020222020223. The reversal of 21020222020220 is 2202022202012.

It is a super-3 number, since 3×21020222020220³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020222020223) 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, 30365714 + ... + 31050233.

It is an arithmetic number, because the mean of its divisors is an integer number (933983029210).

Almost surely, 2^{21020222020220} is an apocalyptic number.

21020222020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020222020220 is an abundant number, since it is smaller than the sum of its proper divisors (23810963381860).

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

21020222020220 is a wasteful number, since it uses less digits than its factorization.

21020222020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61416222 (or 61416220 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21020222020220 its reverse (2202022202012), we get a palindrome (23222244222232).

The spelling of 21020222020220 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, twenty thousand, two hundred twenty".