13451220021 has 8 divisors (see below), whose sum is σ = 17943345504. Its totient is φ = 8963287280.

The previous prime is 13451220011. The next prime is 13451220047. The reversal of 13451220021 is 12002215431.

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

It is a cyclic number.

It is not a de Polignac number, because 13451220021 - 2⁵ = 13451219989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13451220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13451220011) 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, 1040691 + ... + 1053536.

It is an arithmetic number, because the mean of its divisors is an integer number (2242918188).

Almost surely, 2^13451220021 is an apocalyptic number.

It is an amenable number.

13451220021 is a deficient number, since it is larger than the sum of its proper divisors (4492125483).

13451220021 is a wasteful number, since it uses less digits than its factorization.

13451220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096371.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 13451220021 its reverse (12002215431), we get a palindrome (25453435452).

The spelling of 13451220021 in words is "thirteen billion, four hundred fifty-one million, two hundred twenty thousand, twenty-one".