201521226 has 16 divisors (see below), whose sum is σ = 409874400. Its totient is φ = 66035088.

The previous prime is 201521219. The next prime is 201521233. The reversal of 201521226 is 622125102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (201521219) and next prime (201521233).

It is a super-2 number, since 2×201521226² = 81221609057086152, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284281 + ... + 284988.

It is an arithmetic number, because the mean of its divisors is an integer number (25617150).

Almost surely, 2^201521226 is an apocalyptic number.

201521226 is an abundant number, since it is smaller than the sum of its proper divisors (208353174).

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

201521226 is a wasteful number, since it uses less digits than its factorization.

201521226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569333.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 201521226 is about 14195.8172008518. The cubic root of 201521226 is about 586.2825015207.

Adding to 201521226 its reverse (622125102), we get a palindrome (823646328).

The spelling of 201521226 in words is "two hundred one million, five hundred twenty-one thousand, two hundred twenty-six".