20121172303616 has 36 divisors (see below), whose sum is σ = 40164033072072. Its totient is φ = 10060514313216.

The previous prime is 20121172303613. The next prime is 20121172303621. The reversal of 20121172303616 is 61630327112102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121172303613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68564750 + ... + 68857586.

Almost surely, 2^{20121172303616} is an apocalyptic number.

It is an amenable number.

20121172303616 is a deficient number, since it is larger than the sum of its proper divisors (20042860768456).

20121172303616 is an equidigital number, since it uses as much as digits as its factorization.

20121172303616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561256 (or 561242 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

Adding to 20121172303616 its reverse (61630327112102), we get a palindrome (81751499415718).

The spelling of 20121172303616 in words is "twenty trillion, one hundred twenty-one billion, one hundred seventy-two million, three hundred three thousand, six hundred sixteen".