13121001 has 16 divisors (see below), whose sum is σ = 20462400. Its totient is φ = 8286624.

The previous prime is 13120999. The next prime is 13121033. The reversal of 13121001 is 10012131.

13121001 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13121001 - 2¹ = 13120999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13121041) 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, 12276 + ... + 13301.

It is an arithmetic number, because the mean of its divisors is an integer number (1278900).

Almost surely, 2^13121001 is an apocalyptic number.

It is an amenable number.

13121001 is a deficient number, since it is larger than the sum of its proper divisors (7341399).

13121001 is a wasteful number, since it uses less digits than its factorization.

13121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25605 (or 25599 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 13121001 is about 3622.2922300665. The cubic root of 13121001 is about 235.8607396830.

Adding to 13121001 its reverse (10012131), we get a palindrome (23133132).

The spelling of 13121001 in words is "thirteen million, one hundred twenty-one thousand, one".