201521430 has 192 divisors, whose sum is σ = 601675776. Its totient is φ = 46368000.

The previous prime is 201521413. The next prime is 201521431. The reversal of 201521430 is 34125102.

It is a super-2 number, since 2×201521430² = 81221773498489800, 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 (201521431) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2838295 + ... + 2838365.

It is an arithmetic number, because the mean of its divisors is an integer number (3133728).

Almost surely, 2^201521430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201521430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300837888).

201521430 is an abundant number, since it is smaller than the sum of its proper divisors (400154346).

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

201521430 is a wasteful number, since it uses less digits than its factorization.

201521430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 200 counting only the distinct ones).

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

The square root of 201521430 is about 14195.8243860651. The cubic root of 201521430 is about 586.2826993519.

Adding to 201521430 its reverse (34125102), we get a palindrome (235646532).

The spelling of 201521430 in words is "two hundred one million, five hundred twenty-one thousand, four hundred thirty".