213126765381 has 8 divisors (see below), whose sum is σ = 315743356160. Its totient is φ = 142084510236.

The previous prime is 213126765353. The next prime is 213126765443. The reversal of 213126765381 is 183567621312.

It is a happy number.

213126765381 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 267 + 6 + 5 + 381 = 666.

It is not a de Polignac number, because 213126765381 - 2⁷ = 213126765253 is a prime.

It is a super-2 number, since 2×213126765381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213126765301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3946791925 + ... + 3946791978.

It is an arithmetic number, because the mean of its divisors is an integer number (39467919520).

Almost surely, 2^213126765381 is an apocalyptic number.

It is an amenable number.

213126765381 is a deficient number, since it is larger than the sum of its proper divisors (102616590779).

213126765381 is an equidigital number, since it uses as much as digits as its factorization.

213126765381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7893583912 (or 7893583906 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 213126765381 in words is "two hundred thirteen billion, one hundred twenty-six million, seven hundred sixty-five thousand, three hundred eighty-one".