10203212581 has 2 divisors, whose sum is σ = 10203212582. Its totient is φ = 10203212580.

The previous prime is 10203212501. The next prime is 10203212603. The reversal of 10203212581 is 18521230201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9023290081 + 1179922500 = 94991^2 + 34350^2 .

It is an emirp because it is prime and its reverse (18521230201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10203212581 - 2⁹ = 10203212069 is a prime.

It is a super-2 number, since 2×10203212581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10203212501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101606290 + 5101606291.

It is an arithmetic number, because the mean of its divisors is an integer number (5101606291).

Almost surely, 2^10203212581 is an apocalyptic number.

It is an amenable number.

10203212581 is a deficient number, since it is larger than the sum of its proper divisors (1).

10203212581 is an equidigital number, since it uses as much as digits as its factorization.

10203212581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 10203212581 its reverse (18521230201), we get a palindrome (28724442782).

It can be divided in two parts, 10203 and 212581, that added together give a square (222784 = 472²).

The spelling of 10203212581 in words is "ten billion, two hundred three million, two hundred twelve thousand, five hundred eighty-one".