21003065144 has 32 divisors (see below), whose sum is σ = 40574682000. Its totient is φ = 10187603712.

The previous prime is 21003065143. The next prime is 21003065219. The reversal of 21003065144 is 44156030012.

It is a super-2 number, since 2×21003065144² (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 (21003065143) 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, 240554 + ... + 316025.

Almost surely, 2^21003065144 is an apocalyptic number.

It is an amenable number.

21003065144 is a deficient number, since it is larger than the sum of its proper divisors (19571616856).

21003065144 is a wasteful number, since it uses less digits than its factorization.

21003065144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556727 (or 556723 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21003065144 its reverse (44156030012), we get a palindrome (65159095156).

The spelling of 21003065144 in words is "twenty-one billion, three million, sixty-five thousand, one hundred forty-four".