201222540 has 144 divisors (see below), whose sum is σ = 680490720. Its totient is φ = 47831040.

The previous prime is 201222533. The next prime is 201222577. The reversal of 201222540 is 45222102.

201222540 is a `hidden beast` number, since 2 + 0 + 122 + 2 + 540 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56410 + ... + 59870.

It is an arithmetic number, because the mean of its divisors is an integer number (4725630).

Almost surely, 2^201222540 is an apocalyptic number.

201222540 is a gapful number since it is divisible by the number (20) 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 201222540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340245360).

201222540 is an abundant number, since it is smaller than the sum of its proper divisors (479268180).

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

201222540 is a wasteful number, since it uses less digits than its factorization.

201222540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512 (or 3507 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 201222540 is about 14185.2930882657. The cubic root of 201222540 is about 585.9927041534.

Adding to 201222540 its reverse (45222102), we get a palindrome (246444642).

The spelling of 201222540 in words is "two hundred one million, two hundred twenty-two thousand, five hundred forty".