201210421 has 4 divisors (see below), whose sum is σ = 201322144. Its totient is φ = 201098700.

The previous prime is 201210409. The next prime is 201210433. The reversal of 201210421 is 124012102.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (201210409) and next prime (201210433).

It is a cyclic number.

It is not a de Polignac number, because 201210421 - 2¹¹ = 201208373 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 (201210461) 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, 53115 + ... + 56776.

It is an arithmetic number, because the mean of its divisors is an integer number (50330536).

Almost surely, 2^201210421 is an apocalyptic number.

It is an amenable number.

201210421 is a deficient number, since it is larger than the sum of its proper divisors (111723).

201210421 is a wasteful number, since it uses less digits than its factorization.

201210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111722.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 201210421 is about 14184.8659140649. The cubic root of 201210421 is about 585.9809397521.

Adding to 201210421 its reverse (124012102), we get a palindrome (325222523).

The spelling of 201210421 in words is "two hundred one million, two hundred ten thousand, four hundred twenty-one".