13001321421 has 80 divisors (see below), whose sum is σ = 22483441728. Its totient is φ = 7399641600.

The previous prime is 13001321419. The next prime is 13001321429. The reversal of 13001321421 is 12412310031.

13001321421 is a `hidden beast` number, since 1 + 300 + 1 + 321 + 42 + 1 = 666.

It is not a de Polignac number, because 13001321421 - 2¹ = 13001321419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13001321394 and 13001321403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13001321429) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11102166 + ... + 11103336.

Almost surely, 2^13001321421 is an apocalyptic number.

13001321421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13001321421 is a deficient number, since it is larger than the sum of its proper divisors (9482120307).

13001321421 is a wasteful number, since it uses less digits than its factorization.

13001321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944 (or 1935 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13001321421 its reverse (12412310031), we get a palindrome (25413631452).

The spelling of 13001321421 in words is "thirteen billion, one million, three hundred twenty-one thousand, four hundred twenty-one".