21243233330351 has 4 divisors (see below), whose sum is σ = 21247144813104. Its totient is φ = 21239321847600.

The previous prime is 21243233330339. The next prime is 21243233330359. The reversal of 21243233330351 is 15303333234212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21243233330351 - 2¹⁸ = 21243233068207 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 (21243233330359) 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, 1955733230 + ... + 1955744091.

It is an arithmetic number, because the mean of its divisors is an integer number (5311786203276).

Almost surely, 2^{21243233330351} is an apocalyptic number.

21243233330351 is a deficient number, since it is larger than the sum of its proper divisors (3911482753).

21243233330351 is an equidigital number, since it uses as much as digits as its factorization.

21243233330351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911482752.

The product of its (nonzero) digits is 116640, while the sum is 35.

Adding to 21243233330351 its reverse (15303333234212), we get a palindrome (36546566564563).

The spelling of 21243233330351 in words is "twenty-one trillion, two hundred forty-three billion, two hundred thirty-three million, three hundred thirty thousand, three hundred fifty-one".