201221012003 has 4 divisors (see below), whose sum is σ = 219513831288. Its totient is φ = 182928192720.

The previous prime is 201221011949. The next prime is 201221012033. The reversal of 201221012003 is 300210122102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201221012003 - 2⁶ = 201221011939 is a prime.

It is a super-2 number, since 2×201221012003² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221012033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9146409626 + ... + 9146409647.

It is an arithmetic number, because the mean of its divisors is an integer number (54878457822).

Almost surely, 2^201221012003 is an apocalyptic number.

201221012003 is a deficient number, since it is larger than the sum of its proper divisors (18292819285).

201221012003 is a wasteful number, since it uses less digits than its factorization.

201221012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18292819284.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 201221012003 its reverse (300210122102), we get a palindrome (501431134105).

The spelling of 201221012003 in words is "two hundred one billion, two hundred twenty-one million, twelve thousand, three".