154213646456021 has 4 divisors (see below), whose sum is σ = 156326162160972. Its totient is φ = 152101130751072.

The previous prime is 154213646455997. The next prime is 154213646456059. The reversal of 154213646456021 is 120654646312451.

It is a happy number.

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 134022877080625 + 20190769375396 = 11576825^2 + 4493414^2 .

It is a cyclic number.

It is not a de Polignac number, because 154213646456021 - 2¹⁴ = 154213646439637 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 (154213646456071) 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, 1056257852366 + ... + 1056257852511.

It is an arithmetic number, because the mean of its divisors is an integer number (39081540540243).

Almost surely, 2^{154213646456021} is an apocalyptic number.

It is an amenable number.

154213646456021 is a deficient number, since it is larger than the sum of its proper divisors (2112515704951).

154213646456021 is an equidigital number, since it uses as much as digits as its factorization.

154213646456021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112515704950.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 154213646456021 in words is "one hundred fifty-four trillion, two hundred thirteen billion, six hundred forty-six million, four hundred fifty-six thousand, twenty-one".