20121221162 has 8 divisors (see below), whose sum is σ = 34493522016.
Its totient is φ = 8623380492.
The previous prime is 20121221161. The next prime is 20121221249. The reversal of 20121221162 is 26112212102.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not an unprimeable number, because it can be changed into a prime (20121221161) 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 3 ways as a sum of consecutive naturals, for example, 718615028 + ... + 718615055.
It is an arithmetic number, because the mean of its divisors is an integer number (4311690252).
Almost surely, 220121221162 is an apocalyptic number.
20121221162 is a deficient number, since it is larger than the sum of its proper divisors (14372300854).
20121221162 is a wasteful number, since it uses less digits than its factorization.
20121221162 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1437230092.
The product of its (nonzero) digits is 192, while the sum is 20.
Adding to 20121221162 its reverse (26112212102), we get a palindrome (46233433264).
The spelling of 20121221162 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred sixty-two".