2117451240 has 128 divisors (see below), whose sum is σ = 7301664000. Its totient is φ = 545174784.

The previous prime is 2117451239. The next prime is 2117451241. The reversal of 2117451240 is 421547112.

It is an interprime number because it is at equal distance from previous prime (2117451239) and next prime (2117451241).

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

It is not an unprimeable number, because it can be changed into a prime (2117451241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2484 + ... + 65123.

It is an arithmetic number, because the mean of its divisors is an integer number (57044250).

Almost surely, 2^2117451240 is an apocalyptic number.

2117451240 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 2117451240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3650832000).

2117451240 is an abundant number, since it is smaller than the sum of its proper divisors (5184212760).

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

2117451240 is a wasteful number, since it uses less digits than its factorization.

2117451240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67656 (or 67646 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 2117451240 is about 46015.7716440787. The cubic root of 2117451240 is about 1284.1166371467.

Adding to 2117451240 its reverse (421547112), we get a palindrome (2538998352).

The spelling of 2117451240 in words is "two billion, one hundred seventeen million, four hundred fifty-one thousand, two hundred forty".