2101451520 has 144 divisors (see below), whose sum is σ = 7670396160. Its totient is φ = 480325632.

The previous prime is 2101451507. The next prime is 2101451579. The reversal of 2101451520 is 251541012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12210 + ... + 65969.

It is an arithmetic number, because the mean of its divisors is an integer number (53266640).

Almost surely, 2^2101451520 is an apocalyptic number.

2101451520 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 2101451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3835198080).

2101451520 is an abundant number, since it is smaller than the sum of its proper divisors (5568944640).

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

2101451520 is an equidigital number, since it uses as much as digits as its factorization.

2101451520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78210 (or 78196 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 2101451520 is about 45841.5915954060. The cubic root of 2101451520 is about 1280.8741424747.

Adding to 2101451520 its reverse (251541012), we get a palindrome (2352992532).

The spelling of 2101451520 in words is "two billion, one hundred one million, four hundred fifty-one thousand, five hundred twenty".