212005021 has 8 divisors (see below), whose sum is σ = 223689600. Its totient is φ = 200373120.

The previous prime is 212004979. The next prime is 212005033. The reversal of 212005021 is 120500212.

212005021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212005021 - 2¹⁵ = 211972253 is a prime.

It is a super-2 number, since 2×212005021² = 89892257858420882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212004992 and 212005010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212005081) 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, 4756 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (27961200).

Almost surely, 2^212005021 is an apocalyptic number.

It is an amenable number.

212005021 is a deficient number, since it is larger than the sum of its proper divisors (11684579).

212005021 is a wasteful number, since it uses less digits than its factorization.

212005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26339.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 212005021 is about 14560.3921993880. The cubic root of 212005021 is about 596.2779031078.

Adding to 212005021 its reverse (120500212), we get a palindrome (332505233).

The spelling of 212005021 in words is "two hundred twelve million, five thousand, twenty-one".