212120212104 has 64 divisors (see below), whose sum is σ = 596681376000. Its totient is φ = 69811709760.

The previous prime is 212120212079. The next prime is 212120212133. The reversal of 212120212104 is 401212021212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6198367 + ... + 6232494.

It is an arithmetic number, because the mean of its divisors is an integer number (9323146500).

Almost surely, 2^212120212104 is an apocalyptic number.

212120212104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

212120212104 is an abundant number, since it is smaller than the sum of its proper divisors (384561163896).

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

212120212104 is a wasteful number, since it uses less digits than its factorization.

212120212104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12430955 (or 12430945 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212120212104 its reverse (401212021212), we get a palindrome (613332233316).

The spelling of 212120212104 in words is "two hundred twelve billion, one hundred twenty million, two hundred twelve thousand, one hundred four".