21203320434 has 16 divisors (see below), whose sum is σ = 42417943488. Its totient is φ = 7065889712.

The previous prime is 21203320421. The next prime is 21203320469. The reversal of 21203320434 is 43402330212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446457 + ... + 491660.

It is an arithmetic number, because the mean of its divisors is an integer number (2651121468).

Almost surely, 2^21203320434 is an apocalyptic number.

21203320434 is an abundant number, since it is smaller than the sum of its proper divisors (21214623054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203320434 is a wasteful number, since it uses less digits than its factorization.

21203320434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941889.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21203320434 its reverse (43402330212), we get a palindrome (64605650646).

The spelling of 21203320434 in words is "twenty-one billion, two hundred three million, three hundred twenty thousand, four hundred thirty-four".