212121102312020 has 96 divisors (see below), whose sum is σ = 503328469190400. Its totient is φ = 74383060505600.

The previous prime is 212121102312017. The next prime is 212121102312047. The reversal of 212121102312020 is 20213201121212.

It is a super-3 number, since 3×212121102312020³ (a number of 44 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 212121102311983 and 212121102312001.

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 31 ways as a sum of consecutive naturals, for example, 15387296 + ... + 25710135.

It is an arithmetic number, because the mean of its divisors is an integer number (5243004887400).

Almost surely, 2^{212121102312020} is an apocalyptic number.

212121102312020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121102312020 is an abundant number, since it is smaller than the sum of its proper divisors (291207366878380).

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

212121102312020 is a wasteful number, since it uses less digits than its factorization.

212121102312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41098289 (or 41098287 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 212121102312020 its reverse (20213201121212), we get a palindrome (232334303433232).

The spelling of 212121102312020 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred two million, three hundred twelve thousand, twenty".