20121212406 has 64 divisors (see below), whose sum is σ = 42381273600. Its totient is φ = 6356232960.

The previous prime is 20121212351. The next prime is 20121212407. The reversal of 20121212406 is 60421212102.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121212407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10094946 + ... + 10096938.

It is an arithmetic number, because the mean of its divisors is an integer number (662207400).

Almost surely, 2^20121212406 is an apocalyptic number.

20121212406 is an abundant number, since it is smaller than the sum of its proper divisors (22260061194).

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

20121212406 is a wasteful number, since it uses less digits than its factorization.

20121212406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20121212406 its reverse (60421212102), we get a palindrome (80542424508).

The spelling of 20121212406 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, four hundred six".