2145555412 has 96 divisors (see below), whose sum is σ = 5060450304. Its totient is φ = 768700800.

The previous prime is 2145555389. The next prime is 2145555413.

2145555412 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145555413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1244383 + ... + 1246105.

It is an arithmetic number, because the mean of its divisors is an integer number (52713024).

Almost surely, 2^2145555412 is an apocalyptic number.

2145555412 is a gapful number since it is divisible by the number (22) 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 2145555412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2530225152).

2145555412 is an abundant number, since it is smaller than the sum of its proper divisors (2914894892).

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

2145555412 is a wasteful number, since it uses less digits than its factorization.

2145555412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069 (or 2067 counting only the distinct ones).

The product of its digits is 40000, while the sum is 34.

The square root of 2145555412 is about 46320.1404574727. The cubic root of 2145555412 is about 1289.7728927360.

It can be divided in two parts, 21455 and 55412, that added together give a palindrome (76867).

The spelling of 2145555412 in words is "two billion, one hundred forty-five million, five hundred fifty-five thousand, four hundred twelve".