40115221 has 4 divisors (see below), whose sum is σ = 40795200. Its totient is φ = 39435244.

The previous prime is 40115219. The next prime is 40115239. The reversal of 40115221 is 12251104.

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.

It is a cyclic number.

It is not a de Polignac number, because 40115221 - 2¹ = 40115219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40115195 and 40115204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40113221) 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, 339901 + ... + 340018.

It is an arithmetic number, because the mean of its divisors is an integer number (10198800).

Almost surely, 2^40115221 is an apocalyptic number.

It is an amenable number.

40115221 is a deficient number, since it is larger than the sum of its proper divisors (679979).

40115221 is an equidigital number, since it uses as much as digits as its factorization.

40115221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679978.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 40115221 is about 6333.6577899347. The cubic root of 40115221 is about 342.3232497722.

Adding to 40115221 its reverse (12251104), we get a palindrome (52366325).

The spelling of 40115221 in words is "forty million, one hundred fifteen thousand, two hundred twenty-one".