202121211423 has 8 divisors (see below), whose sum is σ = 269498081200. Its totient is φ = 134745907968.

The previous prime is 202121211389. The next prime is 202121211437. The reversal of 202121211423 is 324112121202.

It is a happy number.

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

It is not a de Polignac number, because 202121211423 - 2⁶ = 202121211359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202121211423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121211023) 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, 47218 + ... + 637551.

It is an arithmetic number, because the mean of its divisors is an integer number (33687260150).

Almost surely, 2^202121211423 is an apocalyptic number.

202121211423 is a deficient number, since it is larger than the sum of its proper divisors (67376869777).

202121211423 is an equidigital number, since it uses as much as digits as its factorization.

202121211423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783161.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 202121211423 its reverse (324112121202), we get a palindrome (526233332625).

The spelling of 202121211423 in words is "two hundred two billion, one hundred twenty-one million, two hundred eleven thousand, four hundred twenty-three".