212123210100 has 72 divisors (see below), whose sum is σ = 614017762848. Its totient is φ = 56540880000.

The previous prime is 212123210099. The next prime is 212123210111. The reversal of 212123210100 is 1012321212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212123210100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 518242 + ... + 832358.

It is an arithmetic number, because the mean of its divisors is an integer number (8528024484).

Almost surely, 2^212123210100 is an apocalyptic number.

212123210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212123210100 is an abundant number, since it is smaller than the sum of its proper divisors (401894552748).

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

212123210100 is a wasteful number, since it uses less digits than its factorization.

212123210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316385 (or 316378 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 212123210100 its reverse (1012321212), we get a palindrome (213135531312).

The spelling of 212123210100 in words is "two hundred twelve billion, one hundred twenty-three million, two hundred ten thousand, one hundred".