212234021 has 4 divisors (see below), whose sum is σ = 212293632. Its totient is φ = 212174412.

The previous prime is 212233997. The next prime is 212234051. The reversal of 212234021 is 120432212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212234021 - 2²² = 208039717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212234051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24101 + ... + 31706.

It is an arithmetic number, because the mean of its divisors is an integer number (53073408).

Almost surely, 2^212234021 is an apocalyptic number.

It is an amenable number.

212234021 is a deficient number, since it is larger than the sum of its proper divisors (59611).

212234021 is an equidigital number, since it uses as much as digits as its factorization.

212234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59610.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212234021 is about 14568.2538761514. The cubic root of 212234021 is about 596.4925183153.

Adding to 212234021 its reverse (120432212), we get a palindrome (332666233).

The spelling of 212234021 in words is "two hundred twelve million, two hundred thirty-four thousand, twenty-one".