20381213329 has 2 divisors, whose sum is σ = 20381213330. Its totient is φ = 20381213328.

The previous prime is 20381213299. The next prime is 20381213371. The reversal of 20381213329 is 92331218302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15204123025 + 5177090304 = 123305^2 + 71952^2 .

It is a cyclic number.

It is not a de Polignac number, because 20381213329 - 2²⁵ = 20347658897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20381213294 and 20381213303.

It is not a weakly prime, because it can be changed into another prime (20381213389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190606664 + 10190606665.

It is an arithmetic number, because the mean of its divisors is an integer number (10190606665).

Almost surely, 2^20381213329 is an apocalyptic number.

It is an amenable number.

20381213329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20381213329 is an equidigital number, since it uses as much as digits as its factorization.

20381213329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 20381213329 in words is "twenty billion, three hundred eighty-one million, two hundred thirteen thousand, three hundred twenty-nine".