154222111142221 has 4 divisors (see below), whose sum is σ = 154222373777500. Its totient is φ = 154221848506944.

The previous prime is 154222111142153. The next prime is 154222111142227. The reversal of 154222111142221 is 122241111222451.

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 54222811140996 + 99999300001225 = 7363614^2 + 9999965^2 .

It is a cyclic number.

It is not a de Polignac number, because 154222111142221 - 2¹⁷ = 154222111011149 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 (154222111142227) 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, 130434846 + ... + 131611903.

It is an arithmetic number, because the mean of its divisors is an integer number (38555593444375).

Almost surely, 2^{154222111142221} is an apocalyptic number.

It is an amenable number.

154222111142221 is a deficient number, since it is larger than the sum of its proper divisors (262635279).

154222111142221 is an equidigital number, since it uses as much as digits as its factorization.

154222111142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262635278.

The product of its digits is 5120, while the sum is 31.

Adding to 154222111142221 its reverse (122241111222451), we get a palindrome (276463222364672).

The spelling of 154222111142221 in words is "one hundred fifty-four trillion, two hundred twenty-two billion, one hundred eleven million, one hundred forty-two thousand, two hundred twenty-one".