21002212112020 has 48 divisors (see below), whose sum is σ = 44160332307840. Its totient is φ = 8390278975104.

The previous prime is 21002212111987. The next prime is 21002212112029. The reversal of 21002212112020 is 2021121220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002212111985 and 21002212112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002212112029) 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 15 ways as a sum of consecutive naturals, for example, 560832937 + ... + 560870383.

It is an arithmetic number, because the mean of its divisors is an integer number (920006923080).

Almost surely, 2^{21002212112020} is an apocalyptic number.

21002212112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002212112020 is an abundant number, since it is smaller than the sum of its proper divisors (23158120195820).

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

21002212112020 is a wasteful number, since it uses less digits than its factorization.

21002212112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72112 (or 72110 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002212112020 its reverse (2021121220012), we get a palindrome (23023333332032).

The spelling of 21002212112020 in words is "twenty-one trillion, two billion, two hundred twelve million, one hundred twelve thousand, twenty".