21343403534 has 4 divisors (see below), whose sum is σ = 32015105304. Its totient is φ = 10671701766.

The previous prime is 21343403467. The next prime is 21343403537. The reversal of 21343403534 is 43530434312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21343403534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343403537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5335850882 + ... + 5335850885.

It is an arithmetic number, because the mean of its divisors is an integer number (8003776326).

Almost surely, 2^21343403534 is an apocalyptic number.

21343403534 is a deficient number, since it is larger than the sum of its proper divisors (10671701770).

21343403534 is a wasteful number, since it uses less digits than its factorization.

21343403534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10671701769.

The product of its (nonzero) digits is 51840, while the sum is 32.

Adding to 21343403534 its reverse (43530434312), we get a palindrome (64873837846).

The spelling of 21343403534 in words is "twenty-one billion, three hundred forty-three million, four hundred three thousand, five hundred thirty-four".