21134031434 has 4 divisors (see below), whose sum is σ = 31701047154. Its totient is φ = 10567015716.

The previous prime is 21134031383. The next prime is 21134031439. The reversal of 21134031434 is 43413043112.

It is a happy number.

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., 20462444209 + 671587225 = 143047^2 + 25915^2 .

It is not an unprimeable number, because it can be changed into a prime (21134031439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283507857 + ... + 5283507860.

Almost surely, 2^21134031434 is an apocalyptic number.

21134031434 is a deficient number, since it is larger than the sum of its proper divisors (10567015720).

21134031434 is a wasteful number, since it uses less digits than its factorization.

21134031434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10567015719.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21134031434 its reverse (43413043112), we get a palindrome (64547074546).

The spelling of 21134031434 in words is "twenty-one billion, one hundred thirty-four million, thirty-one thousand, four hundred thirty-four".