10400065421 has 2 divisors, whose sum is σ = 10400065422. Its totient is φ = 10400065420.

The previous prime is 10400065387. The next prime is 10400065477. The reversal of 10400065421 is 12456000401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7321369225 + 3078696196 = 85565^2 + 55486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10400065421 is a prime.

It is a super-2 number, since 2×10400065421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10400061421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200032710 + 5200032711.

It is an arithmetic number, because the mean of its divisors is an integer number (5200032711).

Almost surely, 2^10400065421 is an apocalyptic number.

It is an amenable number.

10400065421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10400065421 is an equidigital number, since it uses as much as digits as its factorization.

10400065421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 10400065421 its reverse (12456000401), we get a palindrome (22856065822).

The spelling of 10400065421 in words is "ten billion, four hundred million, sixty-five thousand, four hundred twenty-one".