20121220195 has 8 divisors (see below), whose sum is σ = 24234563520. Its totient is φ = 16037576640.

The previous prime is 20121220187. The next prime is 20121220241. The reversal of 20121220195 is 59102212102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121220195 - 2³ = 20121220187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7423450 + ... + 7426159.

It is an arithmetic number, because the mean of its divisors is an integer number (3029320440).

Almost surely, 2^20121220195 is an apocalyptic number.

20121220195 is a deficient number, since it is larger than the sum of its proper divisors (4113343325).

20121220195 is a wasteful number, since it uses less digits than its factorization.

20121220195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14849885.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 20121220195 its reverse (59102212102), we get a palindrome (79223432297).

The spelling of 20121220195 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, one hundred ninety-five".