21343202434 has 4 divisors (see below), whose sum is σ = 32014803654. Its totient is φ = 10671601216.

The previous prime is 21343202423. The next prime is 21343202437. The reversal of 21343202434 is 43420234312.

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

It can be written as a sum of positive squares in only one way, i.e., 14152671225 + 7190531209 = 118965^2 + 84797^2 .

It is not an unprimeable number, because it can be changed into a prime (21343202437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5335800607 + ... + 5335800610.

Almost surely, 2^21343202434 is an apocalyptic number.

21343202434 is a deficient number, since it is larger than the sum of its proper divisors (10671601220).

21343202434 is a wasteful number, since it uses less digits than its factorization.

21343202434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10671601219.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21343202434 its reverse (43420234312), we get a palindrome (64763436746).

The spelling of 21343202434 in words is "twenty-one billion, three hundred forty-three million, two hundred two thousand, four hundred thirty-four".