2155101340 has 144 divisors (see below), whose sum is σ = 5460618240. Its totient is φ = 711903360.

The previous prime is 2155101253. The next prime is 2155101341. The reversal of 2155101340 is 431015512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155101341) 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, 3269931 + ... + 3270589.

It is an arithmetic number, because the mean of its divisors is an integer number (37920960).

Almost surely, 2^2155101340 is an apocalyptic number.

2155101340 is a gapful number since it is divisible by the number (20) 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 2155101340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2730309120).

2155101340 is an abundant number, since it is smaller than the sum of its proper divisors (3305516900).

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

2155101340 is a wasteful number, since it uses less digits than its factorization.

2155101340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 2155101340 is about 46423.0690497731. The cubic root of 2155101340 is about 1291.6828666624.

Adding to 2155101340 its reverse (431015512), we get a palindrome (2586116852).

The spelling of 2155101340 in words is "two billion, one hundred fifty-five million, one hundred one thousand, three hundred forty".