3521721500 has 96 divisors (see below), whose sum is σ = 8586369792. Its totient is φ = 1250760000.

The previous prime is 3521721493. The next prime is 3521721503. The reversal of 3521721500 is 51271253.

3521721500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 3521721500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521721503) 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, 229055 + ... + 243945.

It is an arithmetic number, because the mean of its divisors is an integer number (89441352).

Almost surely, 2^3521721500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3521721500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4293184896).

3521721500 is an abundant number, since it is smaller than the sum of its proper divisors (5064648292).

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

3521721500 is a wasteful number, since it uses less digits than its factorization.

3521721500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14964 (or 14952 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 3521721500 is about 59344.0940616672. The cubic root of 3521721500 is about 1521.4289280807.

Adding to 3521721500 its reverse (51271253), we get a palindrome (3572992753).

The spelling of 3521721500 in words is "three billion, five hundred twenty-one million, seven hundred twenty-one thousand, five hundred".