21203445430 has 16 divisors (see below), whose sum is σ = 38503957824. Its totient is φ = 8406321280.

The previous prime is 21203445377. The next prime is 21203445433. The reversal of 21203445430 is 3454430212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203445433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9380926 + ... + 9383185.

It is an arithmetic number, because the mean of its divisors is an integer number (2406497364).

Almost surely, 2^21203445430 is an apocalyptic number.

21203445430 is a deficient number, since it is larger than the sum of its proper divisors (17300512394).

21203445430 is a wasteful number, since it uses less digits than its factorization.

21203445430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18764231.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21203445430 its reverse (3454430212), we get a palindrome (24657875642).

The spelling of 21203445430 in words is "twenty-one billion, two hundred three million, four hundred forty-five thousand, four hundred thirty".