201423302030021 has 4 divisors (see below), whose sum is σ = 201423430063500. Its totient is φ = 201423173996544.

The previous prime is 201423302030011. The next prime is 201423302030029. The reversal of 201423302030021 is 120030203324102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 174250164148225 + 27173137881796 = 13200385^2 + 5212786^2 .

It is a cyclic number.

It is not a de Polignac number, because 201423302030021 - 2²⁶ = 201423234921157 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 (201423302030029) 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, 61627196 + ... + 64813253.

It is an arithmetic number, because the mean of its divisors is an integer number (50355857515875).

Almost surely, 2^{201423302030021} is an apocalyptic number.

It is an amenable number.

201423302030021 is a deficient number, since it is larger than the sum of its proper divisors (128033479).

201423302030021 is a wasteful number, since it uses less digits than its factorization.

201423302030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128033478.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 201423302030021 its reverse (120030203324102), we get a palindrome (321453505354123).

The spelling of 201423302030021 in words is "two hundred one trillion, four hundred twenty-three billion, three hundred two million, thirty thousand, twenty-one".