212102101020 has 48 divisors (see below), whose sum is σ = 606521760768. Its totient is φ = 55357143360.

The previous prime is 212102101019. The next prime is 212102101027. The reversal of 212102101020 is 20101201212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 212102100987 and 212102101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102101027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37603936 + ... + 37609575.

It is an arithmetic number, because the mean of its divisors is an integer number (12635870016).

Almost surely, 2^212102101020 is an apocalyptic number.

212102101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212102101020 is an abundant number, since it is smaller than the sum of its proper divisors (394419659748).

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

212102101020 is a wasteful number, since it uses less digits than its factorization.

212102101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75213570 (or 75213568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212102101020 its reverse (20101201212), we get a palindrome (232203302232).

The spelling of 212102101020 in words is "two hundred twelve billion, one hundred two million, one hundred one thousand, twenty".