212112100021 has 8 divisors (see below), whose sum is σ = 215253957600. Its totient is φ = 208991985840.

The previous prime is 212112099961. The next prime is 212112100049. The reversal of 212112100021 is 120001211212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212112100021 - 2¹¹ = 212112097973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212112099974 and 212112100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112100061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5416195 + ... + 5455216.

It is an arithmetic number, because the mean of its divisors is an integer number (26906744700).

Almost surely, 2^212112100021 is an apocalyptic number.

It is an amenable number.

212112100021 is a deficient number, since it is larger than the sum of its proper divisors (3141857579).

212112100021 is a wasteful number, since it uses less digits than its factorization.

212112100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10871699.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212112100021 its reverse (120001211212), we get a palindrome (332113311233).

The spelling of 212112100021 in words is "two hundred twelve billion, one hundred twelve million, one hundred thousand, twenty-one".