154070021 has 4 divisors (see below), whose sum is σ = 176080032. Its totient is φ = 132060012.

The previous prime is 154069999. The next prime is 154070039. The reversal of 154070021 is 120070451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 154070021 - 2¹⁰ = 154068997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 154069975 and 154070002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154070041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11004995 + ... + 11005008.

It is an arithmetic number, because the mean of its divisors is an integer number (44020008).

Almost surely, 2^154070021 is an apocalyptic number.

It is an amenable number.

154070021 is a deficient number, since it is larger than the sum of its proper divisors (22010011).

154070021 is an equidigital number, since it uses as much as digits as its factorization.

154070021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22010010.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 154070021 is about 12412.4945518618. The cubic root of 154070021 is about 536.0920669151.

The spelling of 154070021 in words is "one hundred fifty-four million, seventy thousand, twenty-one".