201521144 has 48 divisors (see below), whose sum is σ = 437224200. Its totient is φ = 86771520.

The previous prime is 201521141. The next prime is 201521161. The reversal of 201521144 is 441125102.

It is a happy number.

It is a super-2 number, since 2×201521144² = 81221542958137472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12914 + ... + 23870.

Almost surely, 2^201521144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201521144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218612100).

201521144 is an abundant number, since it is smaller than the sum of its proper divisors (235703056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201521144 is a wasteful number, since it uses less digits than its factorization.

201521144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11004 (or 10989 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 201521144 is about 14195.8143126768. The cubic root of 201521144 is about 586.2824220002.

Adding to 201521144 its reverse (441125102), we get a palindrome (642646246).

The spelling of 201521144 in words is "two hundred one million, five hundred twenty-one thousand, one hundred forty-four".