201221023 has 4 divisors (see below), whose sum is σ = 201963808. Its totient is φ = 200478240.

The previous prime is 201221017. The next prime is 201221099. The reversal of 201221023 is 320122102.

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 201221023 - 2⁵ = 201220991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220994 and 201221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221003) 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, 370986 + ... + 371527.

It is an arithmetic number, because the mean of its divisors is an integer number (50490952).

Almost surely, 2^201221023 is an apocalyptic number.

201221023 is a deficient number, since it is larger than the sum of its proper divisors (742785).

201221023 is an equidigital number, since it uses as much as digits as its factorization.

201221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742784.

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

The square root of 201221023 is about 14185.2396172923. The cubic root of 201221023 is about 585.9912315663.

Adding to 201221023 its reverse (320122102), we get a palindrome (521343125).

It can be divided in two parts, 20122102 and 3, that multiplied together give a palindrome (60366306).

The spelling of 201221023 in words is "two hundred one million, two hundred twenty-one thousand, twenty-three".