201521232 has 240 divisors, whose sum is σ = 658082880. Its totient is φ = 56985600.

The previous prime is 201521219. The next prime is 201521233. The reversal of 201521232 is 232125102.

It is a super-2 number, since 2×201521232² = 81221613893595648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521233) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1883323 + ... + 1883429.

It is an arithmetic number, because the mean of its divisors is an integer number (2742012).

Almost surely, 2^201521232 is an apocalyptic number.

201521232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201521232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329041440).

201521232 is an abundant number, since it is smaller than the sum of its proper divisors (456561648).

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

201521232 is a wasteful number, since it uses less digits than its factorization.

201521232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 201521232 is about 14195.8174121817. The cubic root of 201521232 is about 586.2825073392.

Adding to 201521232 its reverse (232125102), we get a palindrome (433646334).

The spelling of 201521232 in words is "two hundred one million, five hundred twenty-one thousand, two hundred thirty-two".