21003433144 has 32 divisors (see below), whose sum is σ = 39686177520. Its totient is φ = 10420690176.

The previous prime is 21003433141. The next prime is 21003433151. The reversal of 21003433144 is 44133430012.

It is a super-2 number, since 2×21003433144² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003433141) 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, 709324 + ... + 738340.

Almost surely, 2^21003433144 is an apocalyptic number.

It is an amenable number.

21003433144 is a deficient number, since it is larger than the sum of its proper divisors (18682744376).

21003433144 is a wasteful number, since it uses less digits than its factorization.

21003433144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29719 (or 29715 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21003433144 its reverse (44133430012), we get a palindrome (65136863156).

The spelling of 21003433144 in words is "twenty-one billion, three million, four hundred thirty-three thousand, one hundred forty-four".