1221544233013 has 8 divisors (see below), whose sum is σ = 1315685833056. Its totient is φ = 1127427870000.

The previous prime is 1221544232983. The next prime is 1221544233029. The reversal of 1221544233013 is 3103324451221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221544233013 - 2⁵ = 1221544232981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221544233073) 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, 6208663 + ... + 6402388.

It is an arithmetic number, because the mean of its divisors is an integer number (164460729132).

Almost surely, 2^{1221544233013} is an apocalyptic number.

1221544233013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221544233013 is a deficient number, since it is larger than the sum of its proper divisors (94141600043).

1221544233013 is a wasteful number, since it uses less digits than its factorization.

1221544233013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12618515.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 1221544233013 its reverse (3103324451221), we get a palindrome (4324868684234).

The spelling of 1221544233013 in words is "one trillion, two hundred twenty-one billion, five hundred forty-four million, two hundred thirty-three thousand, thirteen".