146257221 has 16 divisors (see below), whose sum is σ = 212963328. Its totient is φ = 88546800.

The previous prime is 146257217. The next prime is 146257247. The reversal of 146257221 is 122752641.

It is not a de Polignac number, because 146257221 - 2² = 146257217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146257261) 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, 41436 + ... + 44826.

It is an arithmetic number, because the mean of its divisors is an integer number (13310208).

Almost surely, 2^146257221 is an apocalyptic number.

146257221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

146257221 is a deficient number, since it is larger than the sum of its proper divisors (66706107).

146257221 is a wasteful number, since it uses less digits than its factorization.

146257221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712.

The product of its digits is 6720, while the sum is 30.

The square root of 146257221 is about 12093.6851703689. The cubic root of 146257221 is about 526.8727925649.

The spelling of 146257221 in words is "one hundred forty-six million, two hundred fifty-seven thousand, two hundred twenty-one".