3521231561642 has 8 divisors (see below), whose sum is σ = 5290010941536. Its totient is φ = 1757894581132.

The previous prime is 3521231561609. The next prime is 3521231561647. The reversal of 3521231561642 is 2461651321253.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3521231561642.

It is not an unprimeable number, because it can be changed into a prime (3521231561647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360598228 + ... + 1360600815.

It is an arithmetic number, because the mean of its divisors is an integer number (661251367692).

Almost surely, 2^{3521231561642} is an apocalyptic number.

3521231561642 is a deficient number, since it is larger than the sum of its proper divisors (1768779379894).

3521231561642 is a wasteful number, since it uses less digits than its factorization.

3521231561642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721199692.

The product of its digits is 259200, while the sum is 41.

Adding to 3521231561642 its reverse (2461651321253), we get a palindrome (5982882882895).

The spelling of 3521231561642 in words is "three trillion, five hundred twenty-one billion, two hundred thirty-one million, five hundred sixty-one thousand, six hundred forty-two".