21376927943361 has 27 divisors (see below), whose sum is σ = 30940924371201. Its totient is φ = 14222203361064.

The previous prime is 21376927943303. The next prime is 21376927943401. The reversal of 21376927943361 is 16334972967312.

The square root of 21376927943361 is 4623519.

It is a perfect power (a square), and thus also a powerful number.

21376927943361 is a `hidden beast` number, since 2 + 1 + 3 + 76 + 9 + 2 + 79 + 433 + 61 = 666.

It is not a de Polignac number, because 21376927943361 - 2⁷ = 21376927943233 is a prime.

It is a super-3 number, since 3×21376927943361³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21376927943461) 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 26 ways as a sum of consecutive naturals, for example, 8419426830 + ... + 8419429368.

Almost surely, 2^{21376927943361} is an apocalyptic number.

21376927943361 is the 4623519-th square number.

21376927943361 is the 2311760-th centered octagonal number.

It is an amenable number.

21376927943361 is a deficient number, since it is larger than the sum of its proper divisors (9563996427840).

21376927943361 is an frugal number, since it uses more digits than its factorization.

21376927943361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6298 (or 3149 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 63.

The spelling of 21376927943361 in words is "twenty-one trillion, three hundred seventy-six billion, nine hundred twenty-seven million, nine hundred forty-three thousand, three hundred sixty-one".