212204021 has 8 divisors (see below), whose sum is σ = 219218688. Its totient is φ = 205200000.

The previous prime is 212203973. The next prime is 212204039. The reversal of 212204021 is 120402212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212204021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212203987 and 212204005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212204071) 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, 68261 + ... + 71301.

It is an arithmetic number, because the mean of its divisors is an integer number (27402336).

Almost surely, 2^212204021 is an apocalyptic number.

It is an amenable number.

212204021 is a deficient number, since it is larger than the sum of its proper divisors (7014667).

212204021 is a wasteful number, since it uses less digits than its factorization.

212204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 212204021 is about 14567.2242036704. The cubic root of 212204021 is about 596.4644115762.

Adding to 212204021 its reverse (120402212), we get a palindrome (332606233).

The spelling of 212204021 in words is "two hundred twelve million, two hundred four thousand, twenty-one".