3601121820 has 96 divisors (see below), whose sum is σ = 10439331840. Its totient is φ = 926561280.

The previous prime is 3601121819. The next prime is 3601121833. The reversal of 3601121820 is 281211063.

It is a super-2 number, since 2×3601121820² = 25936156724960224800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665044 + ... + 670436.

It is an arithmetic number, because the mean of its divisors is an integer number (108743040).

Almost surely, 2^3601121820 is an apocalyptic number.

3601121820 is a gapful number since it is divisible by the number (30) 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 3601121820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5219665920).

3601121820 is an abundant number, since it is smaller than the sum of its proper divisors (6838210020).

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

3601121820 is a wasteful number, since it uses less digits than its factorization.

3601121820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795 (or 5793 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 3601121820 is about 60009.3477718263. The cubic root of 3601121820 is about 1532.7780447812.

Adding to 3601121820 its reverse (281211063), we get a palindrome (3882332883).

The spelling of 3601121820 in words is "three billion, six hundred one million, one hundred twenty-one thousand, eight hundred twenty".