212421401 has 4 divisors (see below), whose sum is σ = 212744400. Its totient is φ = 212098404.

The previous prime is 212421389. The next prime is 212421431. The reversal of 212421401 is 104124212.

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 212421401 - 2²⁶ = 145312537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212421401.

It is not an unprimeable number, because it can be changed into a prime (212421431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160511 + ... + 161828.

It is an arithmetic number, because the mean of its divisors is an integer number (53186100).

Almost surely, 2^212421401 is an apocalyptic number.

It is an amenable number.

212421401 is a deficient number, since it is larger than the sum of its proper divisors (322999).

212421401 is an equidigital number, since it uses as much as digits as its factorization.

212421401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322998.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 212421401 is about 14574.6835643180. The cubic root of 212421401 is about 596.6680130982.

Adding to 212421401 its reverse (104124212), we get a palindrome (316545613).

The spelling of 212421401 in words is "two hundred twelve million, four hundred twenty-one thousand, four hundred one".