40405020101 has 4 divisors (see below), whose sum is σ = 40446377292. Its totient is φ = 40363662912.

The previous prime is 40405020083. The next prime is 40405020107. The reversal of 40405020101 is 10102050404.

40405020101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 201010²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37801469476 + 2603550625 = 194426^2 + 51025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40405020101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40405020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405020107) 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, 20677130 + ... + 20679083.

It is an arithmetic number, because the mean of its divisors is an integer number (10111594323).

Almost surely, 2^40405020101 is an apocalyptic number.

It is an amenable number.

40405020101 is a deficient number, since it is larger than the sum of its proper divisors (41357191).

40405020101 is an equidigital number, since it uses as much as digits as its factorization.

40405020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41357190.

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

Adding to 40405020101 its reverse (10102050404), we get a palindrome (50507070505).

The spelling of 40405020101 in words is "forty billion, four hundred five million, twenty thousand, one hundred one".