20171212272 has 60 divisors (see below), whose sum is σ = 58542181880. Its totient is φ = 6723736128.

The previous prime is 20171212253. The next prime is 20171212289. The reversal of 20171212272 is 27221217102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2590147 + ... + 2597922.

Almost surely, 2^20171212272 is an apocalyptic number.

It is an amenable number.

20171212272 is an abundant number, since it is smaller than the sum of its proper divisors (38370969608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20171212272 is an equidigital number, since it uses as much as digits as its factorization.

20171212272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5188092 (or 5188074 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

Adding to 20171212272 its reverse (27221217102), we get a palindrome (47392429374).

The spelling of 20171212272 in words is "twenty billion, one hundred seventy-one million, two hundred twelve thousand, two hundred seventy-two".