21276063161 has 4 divisors (see below), whose sum is σ = 21312937332. Its totient is φ = 21239188992.

The previous prime is 21276063119. The next prime is 21276063167. The reversal of 21276063161 is 16136067212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19427063161 + 1849000000 = 139381^2 + 43000^2 .

It is a cyclic number.

It is not a de Polignac number, because 21276063161 - 2⁶ = 21276063097 is a prime.

It is a super-2 number, since 2×21276063161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21276063167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18436220 + ... + 18437373.

It is an arithmetic number, because the mean of its divisors is an integer number (5328234333).

Almost surely, 2^21276063161 is an apocalyptic number.

It is an amenable number.

21276063161 is a deficient number, since it is larger than the sum of its proper divisors (36874171).

21276063161 is an equidigital number, since it uses as much as digits as its factorization.

21276063161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36874170.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 21276063161 in words is "twenty-one billion, two hundred seventy-six million, sixty-three thousand, one hundred sixty-one".