21021222002020 has 48 divisors (see below), whose sum is σ = 44168420741760. Its totient is φ = 8403946240256.

The previous prime is 21021222001987. The next prime is 21021222002021. The reversal of 21021222002020 is 2020022212012.

It is a junction number, because it is equal to n+sod(n) for n = 21021222001985 and 21021222002003.

It is not an unprimeable number, because it can be changed into a prime (21021222002021) 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, 328789416 + ... + 328853344.

It is an arithmetic number, because the mean of its divisors is an integer number (920175432120).

Almost surely, 2^{21021222002020} is an apocalyptic number.

21021222002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021222002020 is an abundant number, since it is smaller than the sum of its proper divisors (23147198739740).

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

21021222002020 is a wasteful number, since it uses less digits than its factorization.

21021222002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72564 (or 72562 counting only the distinct ones).

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

Adding to 21021222002020 its reverse (2020022212012), we get a palindrome (23041244214032).

The spelling of 21021222002020 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, two thousand, twenty".