212942321 has 4 divisors (see below), whose sum is σ = 217894512. Its totient is φ = 207990132.

The previous prime is 212942311. The next prime is 212942333. The reversal of 212942321 is 123249212.

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 a de Polignac number, because none of the positive numbers 2^k-212942321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212942311) 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, 2476031 + ... + 2476116.

It is an arithmetic number, because the mean of its divisors is an integer number (54473628).

Almost surely, 2^212942321 is an apocalyptic number.

It is an amenable number.

212942321 is a deficient number, since it is larger than the sum of its proper divisors (4952191).

212942321 is an equidigital number, since it uses as much as digits as its factorization.

212942321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952190.

The product of its digits is 1728, while the sum is 26.

The square root of 212942321 is about 14592.5433355533. The cubic root of 212942321 is about 597.1553503351.

The spelling of 212942321 in words is "two hundred twelve million, nine hundred forty-two thousand, three hundred twenty-one".