201121130406 has 32 divisors (see below), whose sum is σ = 459862778880. Its totient is φ = 57443512896.

The previous prime is 201121130381. The next prime is 201121130411. The reversal of 201121130406 is 604031121102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695071 + ... + 940938.

It is an arithmetic number, because the mean of its divisors is an integer number (14370711840).

Almost surely, 2^201121130406 is an apocalyptic number.

201121130406 is an abundant number, since it is smaller than the sum of its proper divisors (258741648474).

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

201121130406 is a wasteful number, since it uses less digits than its factorization.

201121130406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638948.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 201121130406 its reverse (604031121102), we get a palindrome (805152251508).

The spelling of 201121130406 in words is "two hundred one billion, one hundred twenty-one million, one hundred thirty thousand, four hundred six".