21100212002020 has 12 divisors (see below), whose sum is σ = 44310445204284. Its totient is φ = 8440084800800.

The previous prime is 21100212002011. The next prime is 21100212002047. The reversal of 21100212002020 is 2020021200112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10055862525604 + 11044349476416 = 3171098^2 + 3323304^2 .

It is an unprimeable number.

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, 527505300031 + ... + 527505300070.

It is an arithmetic number, because the mean of its divisors is an integer number (3692537100357).

Almost surely, 2^{21100212002020} is an apocalyptic number.

21100212002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100212002020 is an abundant number, since it is smaller than the sum of its proper divisors (23210233202264).

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

21100212002020 is a wasteful number, since it uses less digits than its factorization.

21100212002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055010600110 (or 1055010600108 counting only the distinct ones).

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

Adding to 21100212002020 its reverse (2020021200112), we get a palindrome (23120233202132).

The spelling of 21100212002020 in words is "twenty-one trillion, one hundred billion, two hundred twelve million, two thousand, twenty".