266010215015421 has 24 divisors (see below), whose sum is σ = 384906939636024. Its totient is φ = 177030936391680.

The previous prime is 266010215015417. The next prime is 266010215015449. The reversal of 266010215015421 is 124510512010662.

266010215015421 is a `hidden beast` number, since 2 + 6 + 6 + 0 + 1 + 0 + 215 + 0 + 15 + 421 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 100877717564100 + 165132497451321 = 10043790^2 + 12850389^2 .

It is not a de Polignac number, because 266010215015421 - 2² = 266010215015417 is a prime.

It is a super-2 number, since 2×266010215015421² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266010215015521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 642359251 + ... + 642773231.

It is an arithmetic number, because the mean of its divisors is an integer number (16037789151501).

Almost surely, 2^{266010215015421} is an apocalyptic number.

It is an amenable number.

266010215015421 is a deficient number, since it is larger than the sum of its proper divisors (118896724620603).

266010215015421 is a wasteful number, since it uses less digits than its factorization.

266010215015421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538301 (or 538298 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 266010215015421 in words is "two hundred sixty-six trillion, ten billion, two hundred fifteen million, fifteen thousand, four hundred twenty-one".