201423400443 has 24 divisors (see below), whose sum is σ = 291353952032. Its totient is φ = 134093605248.

The previous prime is 201423400441. The next prime is 201423400459. The reversal of 201423400443 is 344004324102.

It is a happy number.

It is not a de Polignac number, because 201423400443 - 2¹ = 201423400441 is a prime.

It is a super-2 number, since 2×201423400443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201423400441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35818530 + ... + 35824152.

Almost surely, 2^201423400443 is an apocalyptic number.

201423400443 is a deficient number, since it is larger than the sum of its proper divisors (89930551589).

201423400443 is a wasteful number, since it uses less digits than its factorization.

201423400443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515 (or 10512 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 201423400443 its reverse (344004324102), we get a palindrome (545427724545).

The spelling of 201423400443 in words is "two hundred one billion, four hundred twenty-three million, four hundred thousand, four hundred forty-three".