21134379457 has 4 divisors (see below), whose sum is σ = 21480844756. Its totient is φ = 20787914160.

The previous prime is 21134379451. The next prime is 21134379463. The reversal of 21134379457 is 75497343112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21134379451) and next prime (21134379463).

It can be written as a sum of positive squares in 2 ways, for example, as 10351841536 + 10782537921 = 101744^2 + 103839^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134379457 - 2¹¹ = 21134377409 is a prime.

It is a super-2 number, since 2×21134379457² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21134379451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173232558 + ... + 173232679.

It is an arithmetic number, because the mean of its divisors is an integer number (5370211189).

Almost surely, 2^21134379457 is an apocalyptic number.

It is an amenable number.

21134379457 is a deficient number, since it is larger than the sum of its proper divisors (346465299).

21134379457 is an equidigital number, since it uses as much as digits as its factorization.

21134379457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346465298.

The product of its digits is 635040, while the sum is 46.

The spelling of 21134379457 in words is "twenty-one billion, one hundred thirty-four million, three hundred seventy-nine thousand, four hundred fifty-seven".