40021231 has 2 divisors, whose sum is σ = 40021232. Its totient is φ = 40021230.

The previous prime is 40021211. The next prime is 40021243. The reversal of 40021231 is 13212004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40021231 - 2⁵ = 40021199 is a prime.

It is a super-2 number, since 2×40021231² = 3203397861510722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40021211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010615 + 20010616.

It is an arithmetic number, because the mean of its divisors is an integer number (20010616).

Almost surely, 2^40021231 is an apocalyptic number.

40021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021231 is an equidigital number, since it uses as much as digits as its factorization.

40021231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 40021231 is about 6326.2335556000. The cubic root of 40021231 is about 342.0556861321.

Adding to 40021231 its reverse (13212004), we get a palindrome (53233235).

The spelling of 40021231 in words is "forty million, twenty-one thousand, two hundred thirty-one".