421085766517 has 8 divisors (see below), whose sum is σ = 453493293624. Its totient is φ = 388680570048.

The previous prime is 421085766503. The next prime is 421085766547. The reversal of 421085766517 is 715667580124.

It can be written as a sum of positive squares in 4 ways, for example, as 37926004516 + 383159762001 = 194746^2 + 618999^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 421085766517 - 2¹⁵ = 421085733749 is a prime.

It is a super-2 number, since 2×421085766517² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421085766547) 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 in 7 ways as a sum of consecutive naturals, for example, 197998 + ... + 938815.

It is an arithmetic number, because the mean of its divisors is an integer number (56686661703).

Almost surely, 2^421085766517 is an apocalyptic number.

It is an amenable number.

421085766517 is a deficient number, since it is larger than the sum of its proper divisors (32407527107).

421085766517 is a wasteful number, since it uses less digits than its factorization.

421085766517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165319.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 421085766517 in words is "four hundred twenty-one billion, eighty-five million, seven hundred sixty-six thousand, five hundred seventeen".