40143221 has 4 divisors (see below), whose sum is σ = 41527500. Its totient is φ = 38758944.

The previous prime is 40143197. The next prime is 40143227. The reversal of 40143221 is 12234104.

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 16240900 + 23902321 = 4030^2 + 4889^2 .

It is a cyclic number.

It is not a de Polignac number, because 40143221 - 2¹⁰ = 40142197 is a prime.

It is a super-2 number, since 2×40143221² = 3222956384509682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40143221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40143227) 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, 692096 + ... + 692153.

It is an arithmetic number, because the mean of its divisors is an integer number (10381875).

Almost surely, 2^40143221 is an apocalyptic number.

It is an amenable number.

40143221 is a deficient number, since it is larger than the sum of its proper divisors (1384279).

40143221 is a wasteful number, since it uses less digits than its factorization.

40143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384278.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40143221 is about 6335.8678174343. The cubic root of 40143221 is about 342.4028772513.

Adding to 40143221 its reverse (12234104), we get a palindrome (52377325).

The spelling of 40143221 in words is "forty million, one hundred forty-three thousand, two hundred twenty-one".