154421043245242 has 4 divisors (see below), whose sum is σ = 231631564867866. Its totient is φ = 77210521622620.

The previous prime is 154421043245233. The next prime is 154421043245257. The reversal of 154421043245242 is 242542340124451.

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

It can be written as a sum of positive squares in only one way, i.e., 123154706005081 + 31266337240161 = 11097509^2 + 5591631^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38605260811309 + ... + 38605260811312.

Almost surely, 2^{154421043245242} is an apocalyptic number.

154421043245242 is a deficient number, since it is larger than the sum of its proper divisors (77210521622624).

154421043245242 is an equidigital number, since it uses as much as digits as its factorization.

154421043245242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77210521622623.

The product of its (nonzero) digits is 1228800, while the sum is 43.

Adding to 154421043245242 its reverse (242542340124451), we get a palindrome (396963383369693).

The spelling of 154421043245242 in words is "one hundred fifty-four trillion, four hundred twenty-one billion, forty-three million, two hundred forty-five thousand, two hundred forty-two".