201123210421 has 8 divisors (see below), whose sum is σ = 234745632000. Its totient is φ = 168723422448.

The previous prime is 201123210371. The next prime is 201123210439. The reversal of 201123210421 is 124012321102.

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

It is a de Polignac number, because none of the positive numbers 2^k-201123210421 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 (201123210461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305658046 + ... + 305658703.

It is an arithmetic number, because the mean of its divisors is an integer number (29343204000).

Almost surely, 2^201123210421 is an apocalyptic number.

It is an amenable number.

201123210421 is a deficient number, since it is larger than the sum of its proper divisors (33622421579).

201123210421 is an equidigital number, since it uses as much as digits as its factorization.

201123210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611316803.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201123210421 its reverse (124012321102), we get a palindrome (325135531523).

The spelling of 201123210421 in words is "two hundred one billion, one hundred twenty-three million, two hundred ten thousand, four hundred twenty-one".