40221021 has 8 divisors (see below), whose sum is σ = 54507424. Its totient is φ = 26374320.

The previous prime is 40221019. The next prime is 40221023. The reversal of 40221021 is 12012204.

It is an interprime number because it is at equal distance from previous prime (40221019) and next prime (40221023).

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

It is not a de Polignac number, because 40221021 - 2¹ = 40221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40220988 and 40221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40221023) 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, 109711 + ... + 110076.

It is an arithmetic number, because the mean of its divisors is an integer number (6813428).

Almost surely, 2^40221021 is an apocalyptic number.

It is an amenable number.

40221021 is a deficient number, since it is larger than the sum of its proper divisors (14286403).

40221021 is a wasteful number, since it uses less digits than its factorization.

40221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219851.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 40221021 is about 6342.0044938489. The cubic root of 40221021 is about 342.6239336953.

Adding to 40221021 its reverse (12012204), we get a palindrome (52233225).

The spelling of 40221021 in words is "forty million, two hundred twenty-one thousand, twenty-one".