201021221 has 8 divisors (see below), whose sum is σ = 203476320. Its totient is φ = 198577008.

The previous prime is 201021211. The next prime is 201021229. The reversal of 201021221 is 122120102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201021221 - 2²⁶ = 133912357 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38075 + ... + 43031.

It is an arithmetic number, because the mean of its divisors is an integer number (25434540).

Almost surely, 2^201021221 is an apocalyptic number.

It is an amenable number.

201021221 is a deficient number, since it is larger than the sum of its proper divisors (2455099).

201021221 is a wasteful number, since it uses less digits than its factorization.

201021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5443.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201021221 is about 14178.1952659709. The cubic root of 201021221 is about 585.7972144073.

Adding to 201021221 its reverse (122120102), we get a palindrome (323141323).

It can be divided in two parts, 20102 and 1221, that multiplied together give a palindrome (24544542).

The spelling of 201021221 in words is "two hundred one million, twenty-one thousand, two hundred twenty-one".