154213555140421 has 24 divisors (see below), whose sum is σ = 181342363866840. Its totient is φ = 130749495432192.

The previous prime is 154213555140401. The next prime is 154213555140493. The reversal of 154213555140421 is 124041555312451.

It can be written as a sum of positive squares in 4 ways, for example, as 13185722376225 + 141027832764196 = 3631215^2 + 11875514^2 .

It is not a de Polignac number, because 154213555140421 - 2⁵ = 154213555140389 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 (154213555140401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21178096 + ... + 27512521.

It is an arithmetic number, because the mean of its divisors is an integer number (7555931827785).

Almost surely, 2^{154213555140421} is an apocalyptic number.

It is an amenable number.

154213555140421 is a deficient number, since it is larger than the sum of its proper divisors (27128808726419).

154213555140421 is a wasteful number, since it uses less digits than its factorization.

154213555140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48691333 (or 48691326 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 43.

The spelling of 154213555140421 in words is "one hundred fifty-four trillion, two hundred thirteen billion, five hundred fifty-five million, one hundred forty thousand, four hundred twenty-one".