1721273112 has 192 divisors, whose sum is σ = 5269082400. Its totient is φ = 520266240.

The previous prime is 1721273107. The next prime is 1721273117. The reversal of 1721273112 is 2113721271.

It is an interprime number because it is at equal distance from previous prime (1721273107) and next prime (1721273117).

It is a super-2 number, since 2×1721273112² = 5925562252188329088, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721273117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2226358 + ... + 2227130.

Almost surely, 2^1721273112 is an apocalyptic number.

1721273112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721273112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2634541200).

1721273112 is an abundant number, since it is smaller than the sum of its proper divisors (3547809288).

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

1721273112 is a wasteful number, since it uses less digits than its factorization.

1721273112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 852 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 1721273112 is about 41488.2285955908. The cubic root of 1721273112 is about 1198.4408250219.

Adding to 1721273112 its reverse (2113721271), we get a palindrome (3834994383).

The spelling of 1721273112 in words is "one billion, seven hundred twenty-one million, two hundred seventy-three thousand, one hundred twelve".