21021200201020 has 24 divisors (see below), whose sum is σ = 44573108003424. Its totient is φ = 8326844350656.

The previous prime is 21021200200951. The next prime is 21021200201033. The reversal of 21021200201020 is 2010200212012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 5102230999 + ... + 5102235118.

It is an arithmetic number, because the mean of its divisors is an integer number (1857212833476).

Almost surely, 2^{21021200201020} is an apocalyptic number.

21021200201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021200201020 is an abundant number, since it is smaller than the sum of its proper divisors (23551907802404).

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

21021200201020 is a wasteful number, since it uses less digits than its factorization.

21021200201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10204466229 (or 10204466227 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021200201020 its reverse (2010200212012), we get a palindrome (23031400413032).

The spelling of 21021200201020 in words is "twenty-one trillion, twenty-one billion, two hundred million, two hundred one thousand, twenty".