40424120203021 has 4 divisors (see below), whose sum is σ = 40452810140700. Its totient is φ = 40395430265344.

The previous prime is 40424120203003. The next prime is 40424120203231. The reversal of 40424120203021 is 12030202142404.

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 3703550140521 + 36720570062500 = 1924461^2 + 6059750^2 .

It is a cyclic number.

It is not a de Polignac number, because 40424120203021 - 2¹⁵ = 40424120170253 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 (40424120203921) 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, 14344966726 + ... + 14344969543.

It is an arithmetic number, because the mean of its divisors is an integer number (10113202535175).

Almost surely, 2^{40424120203021} is an apocalyptic number.

It is an amenable number.

40424120203021 is a deficient number, since it is larger than the sum of its proper divisors (28689937679).

40424120203021 is a wasteful number, since it uses less digits than its factorization.

40424120203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28689937678.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 40424120203021 its reverse (12030202142404), we get a palindrome (52454322345425).

The spelling of 40424120203021 in words is "forty trillion, four hundred twenty-four billion, one hundred twenty million, two hundred three thousand, twenty-one".