21203212202020 has 12 divisors (see below), whose sum is σ = 44526745624284. Its totient is φ = 8481284880800.

The previous prime is 21203212201981. The next prime is 21203212202021. The reversal of 21203212202020 is 2020221230212.

It can be written as a sum of positive squares in 2 ways, for example, as 16792472971044 + 4410739230976 = 4097862^2 + 2100176^2 .

It is not an unprimeable number, because it can be changed into a prime (21203212202021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530080305031 + ... + 530080305070.

It is an arithmetic number, because the mean of its divisors is an integer number (3710562135357).

Almost surely, 2^{21203212202020} is an apocalyptic number.

21203212202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203212202020 is an abundant number, since it is smaller than the sum of its proper divisors (23323533422264).

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

21203212202020 is a wasteful number, since it uses less digits than its factorization.

21203212202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060160610110 (or 1060160610108 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21203212202020 its reverse (2020221230212), we get a palindrome (23223433432232).

The spelling of 21203212202020 in words is "twenty-one trillion, two hundred three billion, two hundred twelve million, two hundred two thousand, twenty".