21231650329 has 2 divisors, whose sum is σ = 21231650330. Its totient is φ = 21231650328.

The previous prime is 21231650311. The next prime is 21231650333. The reversal of 21231650329 is 92305613212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12537952729 + 8693697600 = 111973^2 + 93240^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231650329 - 2¹³ = 21231642137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21231650294 and 21231650303.

It is not a weakly prime, because it can be changed into another prime (21231650369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615825164 + 10615825165.

It is an arithmetic number, because the mean of its divisors is an integer number (10615825165).

Almost surely, 2^21231650329 is an apocalyptic number.

It is an amenable number.

21231650329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231650329 is an equidigital number, since it uses as much as digits as its factorization.

21231650329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 21231650329 in words is "twenty-one billion, two hundred thirty-one million, six hundred fifty thousand, three hundred twenty-nine".