2145401533221 has 4 divisors (see below), whose sum is σ = 2860535377632. Its totient is φ = 1430267688812.

The previous prime is 2145401533193. The next prime is 2145401533229. The reversal of 2145401533221 is 1223351045412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2145401533221 - 2³⁹ = 1595645719333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145401533229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357566922201 + ... + 357566922206.

It is an arithmetic number, because the mean of its divisors is an integer number (715133844408).

Almost surely, 2^{2145401533221} is an apocalyptic number.

It is an amenable number.

2145401533221 is a deficient number, since it is larger than the sum of its proper divisors (715133844411).

2145401533221 is an equidigital number, since it uses as much as digits as its factorization.

2145401533221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715133844410.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 2145401533221 its reverse (1223351045412), we get a palindrome (3368752578633).

The spelling of 2145401533221 in words is "two trillion, one hundred forty-five billion, four hundred one million, five hundred thirty-three thousand, two hundred twenty-one".