21120321004 has 24 divisors (see below), whose sum is σ = 37911867840. Its totient is φ = 10290322176.

The previous prime is 21120320951. The next prime is 21120321023. The reversal of 21120321004 is 40012302112.

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, 202237 + ... + 288340.

It is an arithmetic number, because the mean of its divisors is an integer number (1579661160).

Almost surely, 2^21120321004 is an apocalyptic number.

It is an amenable number.

21120321004 is a deficient number, since it is larger than the sum of its proper divisors (16791546836).

21120321004 is a wasteful number, since it uses less digits than its factorization.

21120321004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490857 (or 490855 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21120321004 its reverse (40012302112), we get a palindrome (61132623116).

The spelling of 21120321004 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-one thousand, four".