20121220295 has 32 divisors (see below), whose sum is σ = 27519229440. Its totient is φ = 13980320640.

The previous prime is 20121220291. The next prime is 20121220309. The reversal of 20121220295 is 59202212102.

It is not a de Polignac number, because 20121220295 - 2² = 20121220291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121220291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1077377 + ... + 1095893.

It is an arithmetic number, because the mean of its divisors is an integer number (859975920).

Almost surely, 2^20121220295 is an apocalyptic number.

20121220295 is a deficient number, since it is larger than the sum of its proper divisors (7398009145).

20121220295 is a wasteful number, since it uses less digits than its factorization.

20121220295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19415.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 20121220295 its reverse (59202212102), we get a palindrome (79323432397).

The spelling of 20121220295 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred ninety-five".