13121543001 has 32 divisors (see below), whose sum is σ = 20200347648. Its totient is φ = 7421051520.

The previous prime is 13121542979. The next prime is 13121543023. The reversal of 13121543001 is 10034512131.

It is an interprime number because it is at equal distance from previous prime (13121542979) and next prime (13121543023).

It is not a de Polignac number, because 13121543001 - 2¹¹ = 13121540953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13121542001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3325836 + ... + 3329778.

It is an arithmetic number, because the mean of its divisors is an integer number (631260864).

Almost surely, 2^13121543001 is an apocalyptic number.

It is an amenable number.

13121543001 is a deficient number, since it is larger than the sum of its proper divisors (7078804647).

13121543001 is a wasteful number, since it uses less digits than its factorization.

13121543001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5541.

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 13121543001 in words is "thirteen billion, one hundred twenty-one million, five hundred forty-three thousand, one".