21434331434 has 4 divisors (see below), whose sum is σ = 32151497154. Its totient is φ = 10717165716.

The previous prime is 21434331409. The next prime is 21434331469. The reversal of 21434331434 is 43413343412.

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., 18688257025 + 2746074409 = 136705^2 + 52403^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21434331434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358582857 + ... + 5358582860.

Almost surely, 2^21434331434 is an apocalyptic number.

21434331434 is a deficient number, since it is larger than the sum of its proper divisors (10717165720).

21434331434 is a wasteful number, since it uses less digits than its factorization.

21434331434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10717165719.

The product of its digits is 41472, while the sum is 32.

Adding to 21434331434 its reverse (43413343412), we get a palindrome (64847674846).

The spelling of 21434331434 in words is "twenty-one billion, four hundred thirty-four million, three hundred thirty-one thousand, four hundred thirty-four".