2001212550 has 72 divisors (see below), whose sum is σ = 5382293904. Its totient is φ = 533090880.

The previous prime is 2001212527. The next prime is 2001212557. The reversal of 2001212550 is 552121002.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 584644 + ... + 588056.

It is an arithmetic number, because the mean of its divisors is an integer number (74754082).

Almost surely, 2^2001212550 is an apocalyptic number.

2001212550 is an abundant number, since it is smaller than the sum of its proper divisors (3381081354).

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

2001212550 is a wasteful number, since it uses less digits than its factorization.

2001212550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734 (or 4726 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2001212550 is about 44734.9142169737. The cubic root of 2001212550 is about 1260.1756180006.

Adding to 2001212550 its reverse (552121002), we get a palindrome (2553333552).

The spelling of 2001212550 in words is "two billion, one million, two hundred twelve thousand, five hundred fifty".