1221436110540 has 96 divisors (see below), whose sum is σ = 3426510447360. Its totient is φ = 325098660096.

The previous prime is 1221436110509. The next prime is 1221436110553. The reversal of 1221436110540 is 450116341221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1221436110498 and 1221436110507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158274762 + ... + 158282478.

It is an arithmetic number, because the mean of its divisors is an integer number (35692817160).

Almost surely, 2^{1221436110540} is an apocalyptic number.

1221436110540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221436110540 is an abundant number, since it is smaller than the sum of its proper divisors (2205074336820).

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

1221436110540 is a wasteful number, since it uses less digits than its factorization.

1221436110540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12391 (or 12389 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 1221436110540 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-six million, one hundred ten thousand, five hundred forty".