3121602206540 has 24 divisors (see below), whose sum is σ = 6620269238352. Its totient is φ = 1236278100800.

The previous prime is 3121602206507. The next prime is 3121602206543. The reversal of 3121602206540 is 456022061213.

It is a junction number, because it is equal to n+sod(n) for n = 3121602206497 and 3121602206506.

It is not an unprimeable number, because it can be changed into a prime (3121602206543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772671794 + ... + 772675833.

It is an arithmetic number, because the mean of its divisors is an integer number (275844551598).

Almost surely, 2^{3121602206540} is an apocalyptic number.

It is an amenable number.

3121602206540 is an abundant number, since it is smaller than the sum of its proper divisors (3498667031812).

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

3121602206540 is a wasteful number, since it uses less digits than its factorization.

3121602206540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545347737 (or 1545347735 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 3121602206540 its reverse (456022061213), we get a palindrome (3577624267753).

The spelling of 3121602206540 in words is "three trillion, one hundred twenty-one billion, six hundred two million, two hundred six thousand, five hundred forty".