13212001221540 has 72 divisors (see below), whose sum is σ = 40662390558720. Its totient is φ = 3202909385280.

The previous prime is 13212001221511. The next prime is 13212001221581. The reversal of 13212001221540 is 4512210021231.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 13212001221540.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 909910180 + ... + 909924699.

Almost surely, 2^{13212001221540} is an apocalyptic number.

13212001221540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13212001221540 is an abundant number, since it is smaller than the sum of its proper divisors (27450389337180).

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

13212001221540 is a wasteful number, since it uses less digits than its factorization.

13212001221540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819834913 (or 1819834900 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 13212001221540 its reverse (4512210021231), we get a palindrome (17724211242771).

The spelling of 13212001221540 in words is "thirteen trillion, two hundred twelve billion, one million, two hundred twenty-one thousand, five hundred forty".