40205101021 has 4 divisors (see below), whose sum is σ = 40212509344. Its totient is φ = 40197692700.

The previous prime is 40205101019. The next prime is 40205101039. The reversal of 40205101021 is 12010150204.

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 40205101021 - 2¹ = 40205101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40205100986 and 40205101004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40205101051) 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, 3696015 + ... + 3706876.

It is an arithmetic number, because the mean of its divisors is an integer number (10053127336).

Almost surely, 2^40205101021 is an apocalyptic number.

It is an amenable number.

40205101021 is a deficient number, since it is larger than the sum of its proper divisors (7408323).

40205101021 is an equidigital number, since it uses as much as digits as its factorization.

40205101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408322.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 40205101021 its reverse (12010150204), we get a palindrome (52215251225).

The spelling of 40205101021 in words is "forty billion, two hundred five million, one hundred one thousand, twenty-one".