40251052421 has 2 divisors, whose sum is σ = 40251052422. Its totient is φ = 40251052420.

The previous prime is 40251052409. The next prime is 40251052423. The reversal of 40251052421 is 12425015204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30376655521 + 9874396900 = 174289^2 + 99370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40251052421 is a prime.

It is a super-2 number, since 2×40251052421² (a number of 22 digits) contains 22 as substring.

Together with 40251052423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40251052423) 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 as a sum of consecutive naturals, namely, 20125526210 + 20125526211.

It is an arithmetic number, because the mean of its divisors is an integer number (20125526211).

Almost surely, 2^40251052421 is an apocalyptic number.

It is an amenable number.

40251052421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40251052421 is an equidigital number, since it uses as much as digits as its factorization.

40251052421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 40251052421 its reverse (12425015204), we get a palindrome (52676067625).

The spelling of 40251052421 in words is "forty billion, two hundred fifty-one million, fifty-two thousand, four hundred twenty-one".