21010404434 has 8 divisors (see below), whose sum is σ = 31532675328. Its totient is φ = 10499512660.

The previous prime is 21010404377. The next prime is 21010404487. The reversal of 21010404434 is 43440401012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2840162 + ... + 2847549.

It is an arithmetic number, because the mean of its divisors is an integer number (3941584416).

Almost surely, 2^21010404434 is an apocalyptic number.

21010404434 is a deficient number, since it is larger than the sum of its proper divisors (10522270894).

21010404434 is a wasteful number, since it uses less digits than its factorization.

21010404434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5689560.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21010404434 its reverse (43440401012), we get a palindrome (64450805446).

The spelling of 21010404434 in words is "twenty-one billion, ten million, four hundred four thousand, four hundred thirty-four".