10211201981 has 2 divisors, whose sum is σ = 10211201982. Its totient is φ = 10211201980.

The previous prime is 10211201953. The next prime is 10211201983. The reversal of 10211201981 is 18910211201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8880046756 + 1331155225 = 94234^2 + 36485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211201981 is a prime.

It is a super-2 number, since 2×10211201981² (a number of 21 digits) contains 22 as substring.

Together with 10211201983, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10211201981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211201983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105600990 + 5105600991.

It is an arithmetic number, because the mean of its divisors is an integer number (5105600991).

Almost surely, 2^10211201981 is an apocalyptic number.

It is an amenable number.

10211201981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211201981 is an equidigital number, since it uses as much as digits as its factorization.

10211201981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 10211201981 in words is "ten billion, two hundred eleven million, two hundred one thousand, nine hundred eighty-one".