212202021 has 8 divisors (see below), whose sum is σ = 286812160. Its totient is φ = 139529952.

The previous prime is 212202017. The next prime is 212202043. The reversal of 212202021 is 120202212.

212202021 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 not a de Polignac number, because 212202021 - 2² = 212202017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212201988 and 212202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202091) 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, 484261 + ... + 484698.

It is an arithmetic number, because the mean of its divisors is an integer number (35851520).

Almost surely, 2^212202021 is an apocalyptic number.

It is an amenable number.

212202021 is a deficient number, since it is larger than the sum of its proper divisors (74610139).

212202021 is an equidigital number, since it uses as much as digits as its factorization.

212202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969035.

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

The square root of 212202021 is about 14567.1555562505. The cubic root of 212202021 is about 596.4625376994.

Adding to 212202021 its reverse (120202212), we get a palindrome (332404233).

The spelling of 212202021 in words is "two hundred twelve million, two hundred two thousand, twenty-one".