40021311 has 32 divisors (see below), whose sum is σ = 61728768. Its totient is φ = 22825440.

The previous prime is 40021273. The next prime is 40021313. The reversal of 40021311 is 11312004.

It is a happy number.

It is not a de Polignac number, because 40021311 - 2¹⁹ = 39497023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50460 + ... + 51246.

It is an arithmetic number, because the mean of its divisors is an integer number (1929024).

Almost surely, 2^40021311 is an apocalyptic number.

40021311 is a deficient number, since it is larger than the sum of its proper divisors (21707457).

40021311 is a wasteful number, since it uses less digits than its factorization.

40021311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 40021311 is about 6326.2398784744. The cubic root of 40021311 is about 342.0559140481.

Adding to 40021311 its reverse (11312004), we get a palindrome (51333315).

The spelling of 40021311 in words is "forty million, twenty-one thousand, three hundred eleven".