201212421 has 4 divisors (see below), whose sum is σ = 268283232. Its totient is φ = 134141612.

The previous prime is 201212419. The next prime is 201212443. The reversal of 201212421 is 124212102.

201212421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 201212421 - 2¹ = 201212419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201212421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212491) 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, 33535401 + ... + 33535406.

It is an arithmetic number, because the mean of its divisors is an integer number (67070808).

Almost surely, 2^201212421 is an apocalyptic number.

It is an amenable number.

201212421 is a deficient number, since it is larger than the sum of its proper divisors (67070811).

201212421 is an equidigital number, since it uses as much as digits as its factorization.

201212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67070810.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 201212421 is about 14184.9364115600. The cubic root of 201212421 is about 585.9828812652.

Adding to 201212421 its reverse (124212102), we get a palindrome (325424523).

The spelling of 201212421 in words is "two hundred one million, two hundred twelve thousand, four hundred twenty-one".