202142212423 has 4 divisors (see below), whose sum is σ = 202145024448. Its totient is φ = 202139400400.

The previous prime is 202142212417. The next prime is 202142212463. The reversal of 202142212423 is 324212241202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202142212423 is a prime.

It is a super-2 number, since 2×202142212423² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202142212463) 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, 1295278 + ... + 1442923.

It is an arithmetic number, because the mean of its divisors is an integer number (50536256112).

Almost surely, 2^202142212423 is an apocalyptic number.

202142212423 is a deficient number, since it is larger than the sum of its proper divisors (2812025).

202142212423 is an equidigital number, since it uses as much as digits as its factorization.

202142212423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812024.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 202142212423 its reverse (324212241202), we get a palindrome (526354453625).

The spelling of 202142212423 in words is "two hundred two billion, one hundred forty-two million, two hundred twelve thousand, four hundred twenty-three".