212013020981 has 2 divisors, whose sum is σ = 212013020982. Its totient is φ = 212013020980.

The previous prime is 212013020957. The next prime is 212013021029. The reversal of 212013020981 is 189020310212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167097000625 + 44916020356 = 408775^2 + 211934^2 .

It is a cyclic number.

It is not a de Polignac number, because 212013020981 - 2¹⁴ = 212013004597 is a prime.

It is a super-2 number, since 2×212013020981² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212013020281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006510490 + 106006510491.

It is an arithmetic number, because the mean of its divisors is an integer number (106006510491).

Almost surely, 2^212013020981 is an apocalyptic number.

It is an amenable number.

212013020981 is a deficient number, since it is larger than the sum of its proper divisors (1).

212013020981 is an equidigital number, since it uses as much as digits as its factorization.

212013020981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 212013020981 in words is "two hundred twelve billion, thirteen million, twenty thousand, nine hundred eighty-one".