10210021121981 has 2 divisors, whose sum is σ = 10210021121982. Its totient is φ = 10210021121980.

The previous prime is 10210021121863. The next prime is 10210021121987. The reversal of 10210021121981 is 18912112001201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9882007196356 + 328013925625 = 3143566^2 + 572725^2 .

It is a cyclic number.

It is not a de Polignac number, because 10210021121981 - 2¹⁴ = 10210021105597 is a prime.

It is a super-2 number, since 2×10210021121981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10210021121987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105010560990 + 5105010560991.

It is an arithmetic number, because the mean of its divisors is an integer number (5105010560991).

Almost surely, 2^{10210021121981} is an apocalyptic number.

It is an amenable number.

10210021121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10210021121981 is an equidigital number, since it uses as much as digits as its factorization.

10210021121981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The spelling of 10210021121981 in words is "ten trillion, two hundred ten billion, twenty-one million, one hundred twenty-one thousand, nine hundred eighty-one".