201242421 has 16 divisors (see below), whose sum is σ = 307755520. Its totient is φ = 129833280.

The previous prime is 201242417. The next prime is 201242441. The reversal of 201242421 is 124242102.

201242421 is a `hidden beast` number, since 2 + 0 + 1 + 242 + 421 = 666.

It is not a de Polignac number, because 201242421 - 2² = 201242417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201242394 and 201242403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201242401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119380 + ... + 121053.

It is an arithmetic number, because the mean of its divisors is an integer number (19234720).

Almost surely, 2^201242421 is an apocalyptic number.

It is an amenable number.

201242421 is a deficient number, since it is larger than the sum of its proper divisors (106513099).

201242421 is a wasteful number, since it uses less digits than its factorization.

201242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240473 (or 240467 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 201242421 is about 14185.9938319456. The cubic root of 201242421 is about 586.0120024178.

Adding to 201242421 its reverse (124242102), we get a palindrome (325484523).

The spelling of 201242421 in words is "two hundred one million, two hundred forty-two thousand, four hundred twenty-one".