201221101023 has 16 divisors (see below), whose sum is σ = 272549376000. Its totient is φ = 132036415200.

The previous prime is 201221101007. The next prime is 201221101031. The reversal of 201221101023 is 320101122102.

It is not a de Polignac number, because 201221101023 - 2⁴ = 201221101007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221100993 and 201221101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221171023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988223 + ... + 2086976.

It is an arithmetic number, because the mean of its divisors is an integer number (17034336000).

Almost surely, 2^201221101023 is an apocalyptic number.

201221101023 is a deficient number, since it is larger than the sum of its proper divisors (71328274977).

201221101023 is a wasteful number, since it uses less digits than its factorization.

201221101023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075462.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 201221101023 its reverse (320101122102), we get a palindrome (521322223125).

The spelling of 201221101023 in words is "two hundred one billion, two hundred twenty-one million, one hundred one thousand, twenty-three".