40861221 has 4 divisors (see below), whose sum is σ = 54481632. Its totient is φ = 27240812.

The previous prime is 40861213. The next prime is 40861231. The reversal of 40861221 is 12216804.

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 40861221 - 2³ = 40861213 is a prime.

It is a super-2 number, since 2×40861221² = 3339278763221682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40861191 and 40861200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40861231) 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, 6810201 + ... + 6810206.

It is an arithmetic number, because the mean of its divisors is an integer number (13620408).

Almost surely, 2^40861221 is an apocalyptic number.

It is an amenable number.

40861221 is a deficient number, since it is larger than the sum of its proper divisors (13620411).

40861221 is a wasteful number, since it uses less digits than its factorization.

40861221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13620410.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 40861221 is about 6392.2782323675. The cubic root of 40861221 is about 344.4322272192.

The spelling of 40861221 in words is "forty million, eight hundred sixty-one thousand, two hundred twenty-one".