20150121212 has 24 divisors (see below), whose sum is σ = 37979122272. Its totient is φ = 9299102400.

The previous prime is 20150121191. The next prime is 20150121217. The reversal of 20150121212 is 21212105102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20150121217) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 882662 + ... + 905202.

It is an arithmetic number, because the mean of its divisors is an integer number (1582463428).

Almost surely, 2^20150121212 is an apocalyptic number.

It is an amenable number.

20150121212 is a deficient number, since it is larger than the sum of its proper divisors (17829001060).

20150121212 is a wasteful number, since it uses less digits than its factorization.

20150121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39749 (or 39747 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 20150121212 its reverse (21212105102), we get a palindrome (41362226314).

The spelling of 20150121212 in words is "twenty billion, one hundred fifty million, one hundred twenty-one thousand, two hundred twelve".