40121024521 has 2 divisors, whose sum is σ = 40121024522. Its totient is φ = 40121024520.

The previous prime is 40121024519. The next prime is 40121024527. The reversal of 40121024521 is 12542012104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24026550025 + 16094474496 = 155005^2 + 126864^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121024521 - 2¹ = 40121024519 is a prime.

It is a super-2 number, since 2×40121024521² (a number of 22 digits) contains 22 as substring.

Together with 40121024519, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40121024492 and 40121024501.

It is not a weakly prime, because it can be changed into another prime (40121024527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060512260 + 20060512261.

It is an arithmetic number, because the mean of its divisors is an integer number (20060512261).

Almost surely, 2^40121024521 is an apocalyptic number.

It is an amenable number.

40121024521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121024521 is an equidigital number, since it uses as much as digits as its factorization.

40121024521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 40121024521 its reverse (12542012104), we get a palindrome (52663036625).

The spelling of 40121024521 in words is "forty billion, one hundred twenty-one million, twenty-four thousand, five hundred twenty-one".