21427613329 has 2 divisors, whose sum is σ = 21427613330. Its totient is φ = 21427613328.

The previous prime is 21427613243. The next prime is 21427613353. The reversal of 21427613329 is 92331672412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20717284225 + 710329104 = 143935^2 + 26652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21427613329 - 2¹⁷ = 21427482257 is a prime.

It is a super-2 number, since 2×21427613329² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21427613291 and 21427613300.

It is not a weakly prime, because it can be changed into another prime (21427613359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713806664 + 10713806665.

It is an arithmetic number, because the mean of its divisors is an integer number (10713806665).

Almost surely, 2^21427613329 is an apocalyptic number.

It is an amenable number.

21427613329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21427613329 is an equidigital number, since it uses as much as digits as its factorization.

21427613329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The spelling of 21427613329 in words is "twenty-one billion, four hundred twenty-seven million, six hundred thirteen thousand, three hundred twenty-nine".