40401021 has 8 divisors (see below), whose sum is σ = 54011680. Its totient is φ = 26862192.

The previous prime is 40401013. The next prime is 40401043. The reversal of 40401021 is 12010404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40401021 - 2³ = 40401013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40400988 and 40401006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40401001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16630 + ... + 18903.

It is an arithmetic number, because the mean of its divisors is an integer number (6751460).

Almost surely, 2^40401021 is an apocalyptic number.

It is an amenable number.

40401021 is a deficient number, since it is larger than the sum of its proper divisors (13610659).

40401021 is a wasteful number, since it uses less digits than its factorization.

40401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35915.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 40401021 is about 6356.1797488743. The cubic root of 40401021 is about 343.1342848706.

Adding to 40401021 its reverse (12010404), we get a palindrome (52411425).

The spelling of 40401021 in words is "forty million, four hundred one thousand, twenty-one".