21020021200220 has 24 divisors (see below), whose sum is σ = 50448050880864. Its totient is φ = 7206864411456.

The previous prime is 21020021200181. The next prime is 21020021200223. The reversal of 21020021200220 is 2200212002012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21020021200195 and 21020021200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020021200223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75071504147 + ... + 75071504426.

It is an arithmetic number, because the mean of its divisors is an integer number (2102002120036).

Almost surely, 2^{21020021200220} is an apocalyptic number.

21020021200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020021200220 is an abundant number, since it is smaller than the sum of its proper divisors (29428029680644).

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

21020021200220 is a wasteful number, since it uses less digits than its factorization.

21020021200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150143008589 (or 150143008587 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21020021200220 its reverse (2200212002012), we get a palindrome (23220233202232).

The spelling of 21020021200220 in words is "twenty-one trillion, twenty billion, twenty-one million, two hundred thousand, two hundred twenty".