21003440302 has 16 divisors (see below), whose sum is σ = 33938478000. Its totient is φ = 9691083072.

The previous prime is 21003440291. The next prime is 21003440333. The reversal of 21003440302 is 20304430012.

It is a super-2 number, since 2×21003440302² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003440302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24463 + ... + 206410.

It is an arithmetic number, because the mean of its divisors is an integer number (2121154875).

Almost surely, 2^21003440302 is an apocalyptic number.

21003440302 is a deficient number, since it is larger than the sum of its proper divisors (12935037698).

21003440302 is a wasteful number, since it uses less digits than its factorization.

21003440302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234387.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21003440302 its reverse (20304430012), we get a palindrome (41307870314).

The spelling of 21003440302 in words is "twenty-one billion, three million, four hundred forty thousand, three hundred two".