154421474878221 has 16 divisors (see below), whose sum is σ = 207086250408384. Its totient is φ = 102352179256704.

The previous prime is 154421474878193. The next prime is 154421474878241. The reversal of 154421474878221 is 122878474124451.

It is not a de Polignac number, because 154421474878221 - 2¹⁴ = 154421474861837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154421474878241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200565825 + ... + 201334281.

It is an arithmetic number, because the mean of its divisors is an integer number (12942890650524).

Almost surely, 2^{154421474878221} is an apocalyptic number.

It is an amenable number.

154421474878221 is a deficient number, since it is larger than the sum of its proper divisors (52664775530163).

154421474878221 is a wasteful number, since it uses less digits than its factorization.

154421474878221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155820.

The product of its digits is 32112640, while the sum is 60.

The spelling of 154421474878221 in words is "one hundred fifty-four trillion, four hundred twenty-one billion, four hundred seventy-four million, eight hundred seventy-eight thousand, two hundred twenty-one".