40220042021 has 4 divisors (see below), whose sum is σ = 40220444544. Its totient is φ = 40219639500.

The previous prime is 40220042003. The next prime is 40220042039. The reversal of 40220042021 is 12024002204.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (40220042003) and next prime (40220042039).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40220042021 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 (40220042321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75266 + ... + 293436.

It is an arithmetic number, because the mean of its divisors is an integer number (10055111136).

Almost surely, 2^40220042021 is an apocalyptic number.

It is an amenable number.

40220042021 is a deficient number, since it is larger than the sum of its proper divisors (402523).

40220042021 is a wasteful number, since it uses less digits than its factorization.

40220042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402522.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 40220042021 its reverse (12024002204), we get a palindrome (52244044225).

The spelling of 40220042021 in words is "forty billion, two hundred twenty million, forty-two thousand, twenty-one".