20210021329 has 2 divisors, whose sum is σ = 20210021330. Its totient is φ = 20210021328.

The previous prime is 20210021257. The next prime is 20210021333. The reversal of 20210021329 is 92312001202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11151360000 + 9058661329 = 105600^2 + 95177^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210021329 - 2¹¹ = 20210019281 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210021389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105010664 + 10105010665.

It is an arithmetic number, because the mean of its divisors is an integer number (10105010665).

Almost surely, 2^20210021329 is an apocalyptic number.

It is an amenable number.

20210021329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210021329 is an equidigital number, since it uses as much as digits as its factorization.

20210021329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 20210021329 in words is "twenty billion, two hundred ten million, twenty-one thousand, three hundred twenty-nine".