13154253441221 has 4 divisors (see below), whose sum is σ = 13607848387500. Its totient is φ = 12700658494944.

The previous prime is 13154253441193. The next prime is 13154253441233. The reversal of 13154253441221 is 12214435245131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7930222084225 + 5224031356996 = 2816065^2 + 2285614^2 .

It is a cyclic number.

It is not a de Polignac number, because 13154253441221 - 2⁴² = 8756206930117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13154253441521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226797473096 + ... + 226797473153.

It is an arithmetic number, because the mean of its divisors is an integer number (3401962096875).

Almost surely, 2^{13154253441221} is an apocalyptic number.

It is an amenable number.

13154253441221 is a deficient number, since it is larger than the sum of its proper divisors (453594946279).

13154253441221 is an equidigital number, since it uses as much as digits as its factorization.

13154253441221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453594946278.

The product of its digits is 115200, while the sum is 38.

Adding to 13154253441221 its reverse (12214435245131), we get a palindrome (25368688686352).

The spelling of 13154253441221 in words is "thirteen trillion, one hundred fifty-four billion, two hundred fifty-three million, four hundred forty-one thousand, two hundred twenty-one".