212112123021 has 12 divisors (see below), whose sum is σ = 306423225472. Its totient is φ = 141390059976.

The previous prime is 212112123017. The next prime is 212112123023. The reversal of 212112123021 is 120321211212.

It is not a de Polignac number, because 212112123021 - 2² = 212112123017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212112122985 and 212112123003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112123023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1427101 + ... + 1568706.

Almost surely, 2^212112123021 is an apocalyptic number.

It is an amenable number.

212112123021 is a deficient number, since it is larger than the sum of its proper divisors (94311102451).

212112123021 is a wasteful number, since it uses less digits than its factorization.

212112123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003680 (or 3003677 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212112123021 its reverse (120321211212), we get a palindrome (332433334233).

The spelling of 212112123021 in words is "two hundred twelve billion, one hundred twelve million, one hundred twenty-three thousand, twenty-one".