21343342534 has 4 divisors (see below), whose sum is σ = 32015013804. Its totient is φ = 10671671266.

The previous prime is 21343342519. The next prime is 21343342567. The reversal of 21343342534 is 43524334312.

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 21343342534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5335835632 + ... + 5335835635.

It is an arithmetic number, because the mean of its divisors is an integer number (8003753451).

Almost surely, 2^21343342534 is an apocalyptic number.

21343342534 is a deficient number, since it is larger than the sum of its proper divisors (10671671270).

21343342534 is a wasteful number, since it uses less digits than its factorization.

21343342534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10671671269.

The product of its digits is 103680, while the sum is 34.

Adding to 21343342534 its reverse (43524334312), we get a palindrome (64867676846).

The spelling of 21343342534 in words is "twenty-one billion, three hundred forty-three million, three hundred forty-two thousand, five hundred thirty-four".