10222021981 has 2 divisors, whose sum is σ = 10222021982. Its totient is φ = 10222021980.

The previous prime is 10222021973. The next prime is 10222022023. The reversal of 10222021981 is 18912022201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8000408025 + 2221613956 = 89445^2 + 47134^2 .

It is an emirp because it is prime and its reverse (18912022201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10222021981 - 2³ = 10222021973 is a prime.

It is a super-2 number, since 2×10222021981² (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 (10222022981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5111010990 + 5111010991.

It is an arithmetic number, because the mean of its divisors is an integer number (5111010991).

Almost surely, 2^10222021981 is an apocalyptic number.

It is an amenable number.

10222021981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10222021981 is an equidigital number, since it uses as much as digits as its factorization.

10222021981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 10222021981 in words is "ten billion, two hundred twenty-two million, twenty-one thousand, nine hundred eighty-one".