145047221 has 8 divisors (see below), whose sum is σ = 158824800. Its totient is φ = 131368240.

The previous prime is 145047187. The next prime is 145047229. The reversal of 145047221 is 122740541.

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

It is a cyclic number.

It is not a de Polignac number, because 145047221 - 2⁶ = 145047157 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 (145047229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21551 + ... + 27468.

It is an arithmetic number, because the mean of its divisors is an integer number (19853100).

Almost surely, 2^145047221 is an apocalyptic number.

145047221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145047221 is a deficient number, since it is larger than the sum of its proper divisors (13777579).

145047221 is a wasteful number, since it uses less digits than its factorization.

145047221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49299.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 145047221 is about 12043.5551644853. Note that the first 3 decimals coincide. The cubic root of 145047221 is about 525.4158108695.

Adding to 145047221 its reverse (122740541), we get a palindrome (267787762).

The spelling of 145047221 in words is "one hundred forty-five million, forty-seven thousand, two hundred twenty-one".