154020021 has 8 divisors (see below), whose sum is σ = 205819200. Its totient is φ = 102450432.

The previous prime is 154020019. The next prime is 154020049. The reversal of 154020021 is 120020451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 154020021 - 2¹ = 154020019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154020091) 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 7 ways as a sum of consecutive naturals, for example, 55825 + ... + 58518.

It is an arithmetic number, because the mean of its divisors is an integer number (25727400).

Almost surely, 2^154020021 is an apocalyptic number.

It is an amenable number.

154020021 is a deficient number, since it is larger than the sum of its proper divisors (51799179).

154020021 is a wasteful number, since it uses less digits than its factorization.

154020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114795.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 154020021 is about 12410.4802888526. The cubic root of 154020021 is about 536.0340683866.

Adding to 154020021 its reverse (120020451), we get a palindrome (274040472).

The spelling of 154020021 in words is "one hundred fifty-four million, twenty thousand, twenty-one".