201021223 has 4 divisors (see below), whose sum is σ = 216484408. Its totient is φ = 185558040.

The previous prime is 201021211. The next prime is 201021229. The reversal of 201021223 is 322120102.

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 201021223 - 2⁹ = 201020711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15463171 = 201021223 / (2 + 0 + 1 + 0 + 2 + 1 + 2 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731573 + ... + 7731598.

It is an arithmetic number, because the mean of its divisors is an integer number (54121102).

Almost surely, 2^201021223 is an apocalyptic number.

201021223 is a deficient number, since it is larger than the sum of its proper divisors (15463185).

201021223 is a wasteful number, since it uses less digits than its factorization.

201021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15463184.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 201021223 is about 14178.1953365018. The cubic root of 201021223 is about 585.7972163501.

Adding to 201021223 its reverse (322120102), we get a palindrome (523141325).

The spelling of 201021223 in words is "two hundred one million, twenty-one thousand, two hundred twenty-three".