201212021423 has 4 divisors (see below), whose sum is σ = 229956595920. Its totient is φ = 172467446928.

The previous prime is 201212021389. The next prime is 201212021459. The reversal of 201212021423 is 324120212102.

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

It is not a de Polignac number, because 201212021423 - 2¹⁸ = 201211759279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201212021395 and 201212021404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212021123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14372287238 + ... + 14372287251.

It is an arithmetic number, because the mean of its divisors is an integer number (57489148980).

Almost surely, 2^201212021423 is an apocalyptic number.

201212021423 is a deficient number, since it is larger than the sum of its proper divisors (28744574497).

201212021423 is an equidigital number, since it uses as much as digits as its factorization.

201212021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28744574496.

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

Adding to 201212021423 its reverse (324120212102), we get a palindrome (525332233525).

The spelling of 201212021423 in words is "two hundred one billion, two hundred twelve million, twenty-one thousand, four hundred twenty-three".