1012210211981 has 2 divisors, whose sum is σ = 1012210211982. Its totient is φ = 1012210211980.

The previous prime is 1012210211959. The next prime is 1012210212029. The reversal of 1012210211981 is 1891120122101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840723948100 + 171486263881 = 916910^2 + 414109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012210211981 - 2²² = 1012206017677 is a prime.

It is a super-2 number, since 2×1012210211981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012210211081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506105105990 + 506105105991.

It is an arithmetic number, because the mean of its divisors is an integer number (506105105991).

Almost surely, 2^{1012210211981} is an apocalyptic number.

It is an amenable number.

1012210211981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012210211981 is an equidigital number, since it uses as much as digits as its factorization.

1012210211981 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1012210211981 in words is "one trillion, twelve billion, two hundred ten million, two hundred eleven thousand, nine hundred eighty-one".