21033012004 has 24 divisors (see below), whose sum is σ = 38106545400. Its totient is φ = 10145990400.

The previous prime is 21033011969. The next prime is 21033012019. The reversal of 21033012004 is 40021033012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 513022500 + 20519989504 = 22650^2 + 143248^2 .

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, 81232 + ... + 220600.

It is an arithmetic number, because the mean of its divisors is an integer number (1587772725).

Almost surely, 2^21033012004 is an apocalyptic number.

It is an amenable number.

21033012004 is a deficient number, since it is larger than the sum of its proper divisors (17073533396).

21033012004 is a wasteful number, since it uses less digits than its factorization.

21033012004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140703 (or 140701 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21033012004 its reverse (40021033012), we get a palindrome (61054045016).

The spelling of 21033012004 in words is "twenty-one billion, thirty-three million, twelve thousand, four".