13011121221 has 8 divisors (see below), whose sum is σ = 19826470464. Its totient is φ = 7434926400.

The previous prime is 13011121217. The next prime is 13011121231. The reversal of 13011121221 is 12212111031.

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

It is not a de Polignac number, because 13011121221 - 2² = 13011121217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13011121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011121231) 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, 309788580 + ... + 309788621.

It is an arithmetic number, because the mean of its divisors is an integer number (2478308808).

Almost surely, 2^13011121221 is an apocalyptic number.

It is an amenable number.

13011121221 is a deficient number, since it is larger than the sum of its proper divisors (6815349243).

13011121221 is an equidigital number, since it uses as much as digits as its factorization.

13011121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619577211.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 13011121221 its reverse (12212111031), we get a palindrome (25223232252).

The spelling of 13011121221 in words is "thirteen billion, eleven million, one hundred twenty-one thousand, two hundred twenty-one".