20210102281 has 2 divisors, whose sum is σ = 20210102282. Its totient is φ = 20210102280.

The previous prime is 20210102249. The next prime is 20210102303. The reversal of 20210102281 is 18220101202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20189852281 + 20250000 = 142091^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210102281 - 2⁵ = 20210102249 is a prime.

It is a super-2 number, since 2×20210102281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20210102681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105051140 + 10105051141.

It is an arithmetic number, because the mean of its divisors is an integer number (10105051141).

Almost surely, 2^20210102281 is an apocalyptic number.

It is an amenable number.

20210102281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210102281 is an equidigital number, since it uses as much as digits as its factorization.

20210102281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20210102281 its reverse (18220101202), we get a palindrome (38430203483).

The spelling of 20210102281 in words is "twenty billion, two hundred ten million, one hundred two thousand, two hundred eighty-one".