202423142021 has 4 divisors (see below), whose sum is σ = 203665001952. Its totient is φ = 201181282092.

The previous prime is 202423142017. The next prime is 202423142023. The reversal of 202423142021 is 120241324202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120241324202 = 2 ⋅60120662101.

It is a cyclic number.

It is not a de Polignac number, because 202423142021 - 2² = 202423142017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202423142023) 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, 620929721 + ... + 620930046.

It is an arithmetic number, because the mean of its divisors is an integer number (50916250488).

Almost surely, 2^202423142021 is an apocalyptic number.

It is an amenable number.

202423142021 is a deficient number, since it is larger than the sum of its proper divisors (1241859931).

202423142021 is a wasteful number, since it uses less digits than its factorization.

202423142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241859930.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 202423142021 its reverse (120241324202), we get a palindrome (322664466223).

The spelling of 202423142021 in words is "two hundred two billion, four hundred twenty-three million, one hundred forty-two thousand, twenty-one".