13121221001 has 16 divisors (see below), whose sum is σ = 15789144960. Its totient is φ = 10651979520.

The previous prime is 13121220997. The next prime is 13121221019. The reversal of 13121221001 is 10012212131.

It is not a de Polignac number, because 13121221001 - 2² = 13121220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121221081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589841 + ... + 611681.

It is an arithmetic number, because the mean of its divisors is an integer number (986821560).

Almost surely, 2^13121221001 is an apocalyptic number.

It is an amenable number.

13121221001 is a deficient number, since it is larger than the sum of its proper divisors (2667923959).

13121221001 is a wasteful number, since it uses less digits than its factorization.

13121221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26384.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 13121221001 its reverse (10012212131), we get a palindrome (23133433132).

The spelling of 13121221001 in words is "thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, one".