201542421 has 8 divisors (see below), whose sum is σ = 269057824. Its totient is φ = 134194320.

The previous prime is 201542401. The next prime is 201542477. The reversal of 201542421 is 124245102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201542421 - 2⁶ = 201542357 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 (201542401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38986 + ... + 43851.

It is an arithmetic number, because the mean of its divisors is an integer number (33632228).

Almost surely, 2^201542421 is an apocalyptic number.

It is an amenable number.

201542421 is a deficient number, since it is larger than the sum of its proper divisors (67515403).

201542421 is an equidigital number, since it uses as much as digits as its factorization.

201542421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83651.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 201542421 is about 14196.5637039391. The cubic root of 201542421 is about 586.3030548924.

Adding to 201542421 its reverse (124245102), we get a palindrome (325787523).

The spelling of 201542421 in words is "two hundred one million, five hundred forty-two thousand, four hundred twenty-one".