212101010100 has 108 divisors (see below), whose sum is σ = 759792974304. Its totient is φ = 48480229440.

The previous prime is 212101010089. The next prime is 212101010111. The reversal of 212101010100 is 1010101212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212101010089) and next prime (212101010111).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16827114 + ... + 16839713.

Almost surely, 2^212101010100 is an apocalyptic number.

212101010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212101010100 is an abundant number, since it is smaller than the sum of its proper divisors (547691964204).

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

212101010100 is a wasteful number, since it uses less digits than its factorization.

212101010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33666854 (or 33666844 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 212101010100 its reverse (1010101212), we get a palindrome (213111111312).

The spelling of 212101010100 in words is "two hundred twelve billion, one hundred one million, ten thousand, one hundred".