12354200021 has 4 divisors (see below), whose sum is σ = 12412750944. Its totient is φ = 12295649100.

The previous prime is 12354199961. The next prime is 12354200029. The reversal of 12354200021 is 12000245321.

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.

It is a cyclic number.

It is not a de Polignac number, because 12354200021 - 2¹⁸ = 12353937877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12354199966 and 12354200002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12354200029) 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, 29275145 + ... + 29275566.

It is an arithmetic number, because the mean of its divisors is an integer number (3103187736).

Almost surely, 2^12354200021 is an apocalyptic number.

It is an amenable number.

12354200021 is a deficient number, since it is larger than the sum of its proper divisors (58550923).

12354200021 is an equidigital number, since it uses as much as digits as its factorization.

12354200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58550922.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 12354200021 its reverse (12000245321), we get a palindrome (24354445342).

The spelling of 12354200021 in words is "twelve billion, three hundred fifty-four million, two hundred thousand, twenty-one".