210323990081 has 2 divisors, whose sum is σ = 210323990082. Its totient is φ = 210323990080.

The previous prime is 210323990057. The next prime is 210323990087. The reversal of 210323990081 is 180099323012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155188723600 + 55135266481 = 393940^2 + 234809^2 .

It is a cyclic number.

It is not a de Polignac number, because 210323990081 - 2¹⁸ = 210323727937 is a prime.

It is a super-2 number, since 2×210323990081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210323990087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105161995040 + 105161995041.

It is an arithmetic number, because the mean of its divisors is an integer number (105161995041).

Almost surely, 2^210323990081 is an apocalyptic number.

It is an amenable number.

210323990081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210323990081 is an equidigital number, since it uses as much as digits as its factorization.

210323990081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 210323990081 in words is "two hundred ten billion, three hundred twenty-three million, nine hundred ninety thousand, eighty-one".