201004123421 has 4 divisors (see below), whose sum is σ = 201055972572. Its totient is φ = 200952274272.

The previous prime is 201004123409. The next prime is 201004123427. The reversal of 201004123421 is 124321400102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142590067321 + 58414056100 = 377611^2 + 241690^2 .

It is a cyclic number.

It is not a de Polignac number, because 201004123421 - 2¹⁴ = 201004107037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201004123393 and 201004123402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201004123427) 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, 25918760 + ... + 25926513.

It is an arithmetic number, because the mean of its divisors is an integer number (50263993143).

Almost surely, 2^201004123421 is an apocalyptic number.

It is an amenable number.

201004123421 is a deficient number, since it is larger than the sum of its proper divisors (51849151).

201004123421 is an equidigital number, since it uses as much as digits as its factorization.

201004123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51849150.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 201004123421 its reverse (124321400102), we get a palindrome (325325523523).

The spelling of 201004123421 in words is "two hundred one billion, four million, one hundred twenty-three thousand, four hundred twenty-one".