16426602421 has 2 divisors, whose sum is σ = 16426602422. Its totient is φ = 16426602420.

The previous prime is 16426602397. The next prime is 16426602523. The reversal of 16426602421 is 12420662461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11486480625 + 4940121796 = 107175^2 + 70286^2 .

It is a cyclic number.

It is not a de Polignac number, because 16426602421 - 2¹⁹ = 16426078133 is a prime.

It is a super-2 number, since 2×16426602421² (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 (16426602821) 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, 8213301210 + 8213301211.

It is an arithmetic number, because the mean of its divisors is an integer number (8213301211).

Almost surely, 2^16426602421 is an apocalyptic number.

It is an amenable number.

16426602421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16426602421 is an equidigital number, since it uses as much as digits as its factorization.

16426602421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 16426602421 in words is "sixteen billion, four hundred twenty-six million, six hundred two thousand, four hundred twenty-one".