40021321 has 4 divisors (see below), whose sum is σ = 40528000. Its totient is φ = 39514644.

The previous prime is 40021313. The next prime is 40021337. The reversal of 40021321 is 12312004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40021321 - 2³ = 40021313 is a prime.

It is a super-2 number, since 2×40021321² = 3203412269170082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021361) 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, 253221 + ... + 253378.

It is an arithmetic number, because the mean of its divisors is an integer number (10132000).

Almost surely, 2^40021321 is an apocalyptic number.

It is an amenable number.

40021321 is a deficient number, since it is larger than the sum of its proper divisors (506679).

40021321 is an equidigital number, since it uses as much as digits as its factorization.

40021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506678.

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

The square root of 40021321 is about 6326.2406688333. The cubic root of 40021321 is about 342.0559425376.

Adding to 40021321 its reverse (12312004), we get a palindrome (52333325).

The spelling of 40021321 in words is "forty million, twenty-one thousand, three hundred twenty-one".