212340021 has 8 divisors (see below), whose sum is σ = 284357280. Its totient is φ = 140941392.

The previous prime is 212340019. The next prime is 212340041. The reversal of 212340021 is 120043212.

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

It is not a de Polignac number, because 212340021 - 2¹ = 212340019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212340041) 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, 153855 + ... + 155228.

It is an arithmetic number, because the mean of its divisors is an integer number (35544660).

Almost surely, 2^212340021 is an apocalyptic number.

It is an amenable number.

212340021 is a deficient number, since it is larger than the sum of its proper divisors (72017259).

212340021 is a wasteful number, since it uses less digits than its factorization.

212340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309315.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 212340021 is about 14571.8914695382. The cubic root of 212340021 is about 596.5918075860.

Adding to 212340021 its reverse (120043212), we get a palindrome (332383233).

The spelling of 212340021 in words is "two hundred twelve million, three hundred forty thousand, twenty-one".