212342021 has 8 divisors (see below), whose sum is σ = 214842264. Its totient is φ = 209848320.

The previous prime is 212341999. The next prime is 212342047. The reversal of 212342021 is 120243212.

It can be written as a sum of positive squares in 4 ways, for example, as 784996 + 211557025 = 886^2 + 14545^2 .

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 212342021 - 2²⁶ = 145233157 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 (212342051) 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, 97181 + ... + 99341.

It is an arithmetic number, because the mean of its divisors is an integer number (26855283).

Almost surely, 2^212342021 is an apocalyptic number.

It is an amenable number.

212342021 is a deficient number, since it is larger than the sum of its proper divisors (2500243).

212342021 is a wasteful number, since it uses less digits than its factorization.

212342021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271.

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

The square root of 212342021 is about 14571.9600946475. The cubic root of 212342021 is about 596.5936806508.

Adding to 212342021 its reverse (120243212), we get a palindrome (332585233).

It can be divided in two parts, 2123 and 42021, that added together give a palindrome (44144).

The spelling of 212342021 in words is "two hundred twelve million, three hundred forty-two thousand, twenty-one".