154550021 has 4 divisors (see below), whose sum is σ = 154609344. Its totient is φ = 154490700.

The previous prime is 154550017. The next prime is 154550023. The reversal of 154550021 is 120055451.

It is a happy number.

154550021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120055451 = 379 ⋅316769.

It is a cyclic number.

It is not a de Polignac number, because 154550021 - 2² = 154550017 is a prime.

It is a super-2 number, since 2×154550021² = 47771417982200882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154550023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25565 + ... + 31026.

It is an arithmetic number, because the mean of its divisors is an integer number (38652336).

Almost surely, 2^154550021 is an apocalyptic number.

It is an amenable number.

154550021 is a deficient number, since it is larger than the sum of its proper divisors (59323).

154550021 is an equidigital number, since it uses as much as digits as its factorization.

154550021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59322.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 154550021 is about 12431.8148715302. The cubic root of 154550021 is about 536.6482153981.

The spelling of 154550021 in words is "one hundred fifty-four million, five hundred fifty thousand, twenty-one".