40012421 has 4 divisors (see below), whose sum is σ = 40074912. Its totient is φ = 39949932.

The previous prime is 40012417. The next prime is 40012447. The reversal of 40012421 is 12421004.

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 40012421 - 2² = 40012417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40012396 and 40012405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40012411) 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, 30275 + ... + 31568.

It is an arithmetic number, because the mean of its divisors is an integer number (10018728).

Almost surely, 2^40012421 is an apocalyptic number.

It is an amenable number.

40012421 is a deficient number, since it is larger than the sum of its proper divisors (62491).

40012421 is an equidigital number, since it uses as much as digits as its factorization.

40012421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62490.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 40012421 is about 6325.5372103877. The cubic root of 40012421 is about 342.0305850239.

Adding to 40012421 its reverse (12421004), we get a palindrome (52433425).

It can be divided in two parts, 400 and 12421, that added together give a palindrome (12821).

The spelling of 40012421 in words is "forty million, twelve thousand, four hundred twenty-one".