1111221321540 has 48 divisors (see below), whose sum is σ = 3394276038720. Its totient is φ = 269386986880.

The previous prime is 1111221321517. The next prime is 1111221321563. The reversal of 1111221321540 is 451231221111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1111221321517) and next prime (1111221321563).

It is a self number, because there is not a number n which added to its sum of digits gives 1111221321540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841833675 + ... + 841834994.

It is an arithmetic number, because the mean of its divisors is an integer number (70714084140).

Almost surely, 2^{1111221321540} is an apocalyptic number.

1111221321540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111221321540 is an abundant number, since it is smaller than the sum of its proper divisors (2283054717180).

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

1111221321540 is a wasteful number, since it uses less digits than its factorization.

1111221321540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683668692 (or 1683668690 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

Adding to 1111221321540 its reverse (451231221111), we get a palindrome (1562452542651).

The spelling of 1111221321540 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, three hundred twenty-one thousand, five hundred forty".