212421421 has 8 divisors (see below), whose sum is σ = 215720064. Its totient is φ = 209131440.

The previous prime is 212421389. The next prime is 212421431. The reversal of 212421421 is 124124212.

212421421 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 a cyclic number.

It is not a de Polignac number, because 212421421 - 2⁵ = 212421389 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 (212421431) 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, 61291 + ... + 64663.

It is an arithmetic number, because the mean of its divisors is an integer number (26965008).

Almost surely, 2^212421421 is an apocalyptic number.

It is an amenable number.

212421421 is a deficient number, since it is larger than the sum of its proper divisors (3298643).

212421421 is an equidigital number, since it uses as much as digits as its factorization.

212421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331.

The product of its digits is 256, while the sum is 19.

The square root of 212421421 is about 14574.6842504392. The cubic root of 212421421 is about 596.6680318242.

Adding to 212421421 its reverse (124124212), we get a palindrome (336545633).

The spelling of 212421421 in words is "two hundred twelve million, four hundred twenty-one thousand, four hundred twenty-one".