415140221 has 4 divisors (see below), whose sum is σ = 439560252. Its totient is φ = 390720192.

The previous prime is 415140217. The next prime is 415140247. The reversal of 415140221 is 122041514.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368217721 + 46922500 = 19189^2 + 6850^2 .

It is a cyclic number.

It is not a de Polignac number, because 415140221 - 2² = 415140217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 415140193 and 415140202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (415140821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12209990 + ... + 12210023.

It is an arithmetic number, because the mean of its divisors is an integer number (109890063).

Almost surely, 2^415140221 is an apocalyptic number.

It is an amenable number.

415140221 is a deficient number, since it is larger than the sum of its proper divisors (24420031).

415140221 is a wasteful number, since it uses less digits than its factorization.

415140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24420030.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 415140221 is about 20374.9900858872. The cubic root of 415140221 is about 745.9875922438.

Adding to 415140221 its reverse (122041514), we get a palindrome (537181735).

The spelling of 415140221 in words is "four hundred fifteen million, one hundred forty thousand, two hundred twenty-one".