154198021 has 16 divisors (see below), whose sum is σ = 160128576. Its totient is φ = 148427136.

The previous prime is 154198019. The next prime is 154198027. The reversal of 154198021 is 120891451.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 154198021 - 2¹ = 154198019 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 (154198027) 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, 982075 + ... + 982231.

It is an arithmetic number, because the mean of its divisors is an integer number (10008036).

Almost surely, 2^154198021 is an apocalyptic number.

It is an amenable number.

154198021 is a deficient number, since it is larger than the sum of its proper divisors (5930555).

154198021 is a wasteful number, since it uses less digits than its factorization.

154198021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 154198021 is about 12417.6495763087. The cubic root of 154198021 is about 536.2404859910.

The spelling of 154198021 in words is "one hundred fifty-four million, one hundred ninety-eight thousand, twenty-one".