201221012004 has 24 divisors (see below), whose sum is σ = 478374482880. Its totient is φ = 65808129504.

The previous prime is 201221011949. The next prime is 201221012033. The reversal of 201221012004 is 400210122102.

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, 158191984 + ... + 158193255.

It is an arithmetic number, because the mean of its divisors is an integer number (19932270120).

Almost surely, 2^201221012004 is an apocalyptic number.

It is an amenable number.

201221012004 is an abundant number, since it is smaller than the sum of its proper divisors (277153470876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201221012004 is a wasteful number, since it uses less digits than its factorization.

201221012004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316385299 (or 316385297 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 201221012004 its reverse (400210122102), we get a palindrome (601431134106).

The spelling of 201221012004 in words is "two hundred one billion, two hundred twenty-one million, twelve thousand, four".