21343232433 has 24 divisors (see below), whose sum is σ = 28871614080. Its totient is φ = 14023401600.

The previous prime is 21343232423. The next prime is 21343232441. The reversal of 21343232433 is 33423234312.

It is not a de Polignac number, because 21343232433 - 2¹³ = 21343224241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21343232433.

It is not an unprimeable number, because it can be changed into a prime (21343232413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29684248 + ... + 29684966.

It is an arithmetic number, because the mean of its divisors is an integer number (1202983920).

Almost surely, 2^21343232433 is an apocalyptic number.

It is an amenable number.

21343232433 is a deficient number, since it is larger than the sum of its proper divisors (7528381647).

21343232433 is an equidigital number, since it uses as much as digits as its factorization.

21343232433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449 (or 1136 counting only the distinct ones).

The product of its digits is 31104, while the sum is 30.

Adding to 21343232433 its reverse (33423234312), we get a palindrome (54766466745).

The spelling of 21343232433 in words is "twenty-one billion, three hundred forty-three million, two hundred thirty-two thousand, four hundred thirty-three".