40020121 has 4 divisors (see below), whose sum is σ = 40045072. Its totient is φ = 39995172.

The previous prime is 40020119. The next prime is 40020131. The reversal of 40020121 is 12102004.

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 40020121 - 2¹ = 40020119 is a prime.

It is a super-2 number, since 2×40020121² = 3203220169709282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40020098 and 40020107.

It is not an unprimeable number, because it can be changed into a prime (40020131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9891 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (10011268).

Almost surely, 2^40020121 is an apocalyptic number.

It is an amenable number.

40020121 is a deficient number, since it is larger than the sum of its proper divisors (24951).

40020121 is a wasteful number, since it uses less digits than its factorization.

40020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24950.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 40020121 is about 6326.1458250660. The cubic root of 40020121 is about 342.0525237662.

Adding to 40020121 its reverse (12102004), we get a palindrome (52122125).

The spelling of 40020121 in words is "forty million, twenty thousand, one hundred twenty-one".