21612286273 has 2 divisors, whose sum is σ = 21612286274. Its totient is φ = 21612286272.

The previous prime is 21612286247. The next prime is 21612286277. The reversal of 21612286273 is 37268221612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10836185409 + 10776100864 = 104097^2 + 103808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21612286273 is a prime.

It is a super-2 number, since 2×21612286273² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21612286277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806143136 + 10806143137.

It is an arithmetic number, because the mean of its divisors is an integer number (10806143137).

Almost surely, 2^21612286273 is an apocalyptic number.

It is an amenable number.

21612286273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612286273 is an equidigital number, since it uses as much as digits as its factorization.

21612286273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The spelling of 21612286273 in words is "twenty-one billion, six hundred twelve million, two hundred eighty-six thousand, two hundred seventy-three".