21044200430 has 64 divisors (see below), whose sum is σ = 42333401088. Its totient is φ = 7465772160.

The previous prime is 21044200427. The next prime is 21044200477. The reversal of 21044200430 is 3400244012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5139464 + ... + 5143556.

It is an arithmetic number, because the mean of its divisors is an integer number (661459392).

Almost surely, 2^21044200430 is an apocalyptic number.

21044200430 is an abundant number, since it is smaller than the sum of its proper divisors (21289200658).

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

21044200430 is a wasteful number, since it uses less digits than its factorization.

21044200430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21044200430 its reverse (3400244012), we get a palindrome (24444444442).

The spelling of 21044200430 in words is "twenty-one billion, forty-four million, two hundred thousand, four hundred thirty".