21203050634 has 32 divisors (see below), whose sum is σ = 32793258240. Its totient is φ = 10277467200.

The previous prime is 21203050619. The next prime is 21203050637. The reversal of 21203050634 is 43605030212.

It is not an unprimeable number, because it can be changed into a prime (21203050637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6581144 + ... + 6584364.

It is an arithmetic number, because the mean of its divisors is an integer number (1024789320).

Almost surely, 2^21203050634 is an apocalyptic number.

21203050634 is a deficient number, since it is larger than the sum of its proper divisors (11590207606).

21203050634 is a wasteful number, since it uses less digits than its factorization.

21203050634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21203050634 its reverse (43605030212), we get a palindrome (64808080846).

The spelling of 21203050634 in words is "twenty-one billion, two hundred three million, fifty thousand, six hundred thirty-four".