40420221 has 8 divisors (see below), whose sum is σ = 53942784. Its totient is φ = 26922240.

The previous prime is 40420157. The next prime is 40420231. The reversal of 40420221 is 12202404.

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

It is not a de Polignac number, because 40420221 - 2⁶ = 40420157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40420221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40420231) 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, 1885 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (6742848).

Almost surely, 2^40420221 is an apocalyptic number.

It is an amenable number.

40420221 is a deficient number, since it is larger than the sum of its proper divisors (13522563).

40420221 is a wasteful number, since it uses less digits than its factorization.

40420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12291.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40420221 is about 6357.6899106515. The cubic root of 40420221 is about 343.1886327949.

Adding to 40420221 its reverse (12202404), we get a palindrome (52622625).

The spelling of 40420221 in words is "forty million, four hundred twenty thousand, two hundred twenty-one".