212123330021 has 8 divisors (see below), whose sum is σ = 212254271040. Its totient is φ = 211992432768.

The previous prime is 212123329981. The next prime is 212123330053. The reversal of 212123330021 is 120033321212.

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 212123330021 - 2²² = 212119135717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212123329975 and 212123330002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212123330521) 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, 16113440 + ... + 16126598.

It is an arithmetic number, because the mean of its divisors is an integer number (26531783880).

Almost surely, 2^212123330021 is an apocalyptic number.

It is an amenable number.

212123330021 is a deficient number, since it is larger than the sum of its proper divisors (130941019).

212123330021 is a wasteful number, since it uses less digits than its factorization.

212123330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21883.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 212123330021 its reverse (120033321212), we get a palindrome (332156651233).

The spelling of 212123330021 in words is "two hundred twelve billion, one hundred twenty-three million, three hundred thirty thousand, twenty-one".