4040121021 has 8 divisors (see below), whose sum is σ = 5401834560. Its totient is φ = 2685910752.

The previous prime is 4040121011. The next prime is 4040121049. The reversal of 4040121021 is 1201210404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4040121021 - 2⁵ = 4040120989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4040121011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1874560 + ... + 1876713.

It is an arithmetic number, because the mean of its divisors is an integer number (675229320).

Almost surely, 2^4040121021 is an apocalyptic number.

It is an amenable number.

4040121021 is a deficient number, since it is larger than the sum of its proper divisors (1361713539).

4040121021 is a wasteful number, since it uses less digits than its factorization.

4040121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751635.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 4040121021 is about 63561.9463279721. The cubic root of 4040121021 is about 1592.6907514254.

Adding to 4040121021 its reverse (1201210404), we get a palindrome (5241331425).

The spelling of 4040121021 in words is "four billion, forty million, one hundred twenty-one thousand, twenty-one".