21304223144 has 8 divisors (see below), whose sum is σ = 39945418410. Its totient is φ = 10652111568.

The previous prime is 21304223141. The next prime is 21304223147. The reversal of 21304223144 is 44132240312.

It is an interprime number because it is at equal distance from previous prime (21304223141) and next prime (21304223147).

It can be written as a sum of positive squares in only one way, i.e., 17098700644 + 4205522500 = 130762^2 + 64850^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21304223141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331513939 + ... + 1331513954.

Almost surely, 2^21304223144 is an apocalyptic number.

It is an amenable number.

21304223144 is a deficient number, since it is larger than the sum of its proper divisors (18641195266).

21304223144 is a wasteful number, since it uses less digits than its factorization.

21304223144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663027899 (or 2663027895 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21304223144 its reverse (44132240312), we get a palindrome (65436463456).

The spelling of 21304223144 in words is "twenty-one billion, three hundred four million, two hundred twenty-three thousand, one hundred forty-four".