415040021 has 4 divisors (see below), whose sum is σ = 452770944. Its totient is φ = 377309100.

The previous prime is 415039957. The next prime is 415040029. The reversal of 415040021 is 120040514.

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 415040021 - 2⁶ = 415039957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (415040029) 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, 18865445 + ... + 18865466.

It is an arithmetic number, because the mean of its divisors is an integer number (113192736).

Almost surely, 2^415040021 is an apocalyptic number.

It is an amenable number.

415040021 is a deficient number, since it is larger than the sum of its proper divisors (37730923).

415040021 is a wasteful number, since it uses less digits than its factorization.

415040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37730922.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 415040021 is about 20372.5310405948. The cubic root of 415040021 is about 745.9275691740.

Adding to 415040021 its reverse (120040514), we get a palindrome (535080535).

The spelling of 415040021 in words is "four hundred fifteen million, forty thousand, twenty-one".