212004021 has 8 divisors (see below), whose sum is σ = 284898304. Its totient is φ = 140222880.

The previous prime is 212003993. The next prime is 212004029. The reversal of 212004021 is 120400212.

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

It is not a de Polignac number, because 212004021 - 2⁷ = 212003893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212003988 and 212004006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212004029) 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, 277840 + ... + 278601.

It is an arithmetic number, because the mean of its divisors is an integer number (35612288).

Almost surely, 2^212004021 is an apocalyptic number.

It is an amenable number.

212004021 is a deficient number, since it is larger than the sum of its proper divisors (72894283).

212004021 is a wasteful number, since it uses less digits than its factorization.

212004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556571.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 212004021 is about 14560.3578596132. The cubic root of 212004021 is about 596.2769655847.

Adding to 212004021 its reverse (120400212), we get a palindrome (332404233).

The spelling of 212004021 in words is "two hundred twelve million, four thousand, twenty-one".