154200244643221 has 6 divisors (see below), whose sum is σ = 179375794789110. Its totient is φ = 132171638265576.

The previous prime is 154200244643209. The next prime is 154200244643261. The reversal of 154200244643221 is 122346442002451.

154200244643221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 91701116644900 + 62499127998321 = 9576070^2 + 7905639^2 .

It is not a de Polignac number, because 154200244643221 - 2¹⁹ = 154200244118933 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 (154200244643201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1573471884066 + ... + 1573471884163.

It is an arithmetic number, because the mean of its divisors is an integer number (29895965798185).

Almost surely, 2^{154200244643221} is an apocalyptic number.

It is an amenable number.

154200244643221 is a deficient number, since it is larger than the sum of its proper divisors (25175550145889).

154200244643221 is an equidigital number, since it uses as much as digits as its factorization.

154200244643221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146943768243 (or 3146943768236 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 40.

Adding to 154200244643221 its reverse (122346442002451), we get a palindrome (276546686645672).

The spelling of 154200244643221 in words is "one hundred fifty-four trillion, two hundred billion, two hundred forty-four million, six hundred forty-three thousand, two hundred twenty-one".