221010102012181 has 2 divisors, whose sum is σ = 221010102012182. Its totient is φ = 221010102012180.

The previous prime is 221010102012083. The next prime is 221010102012211. The reversal of 221010102012181 is 181210201010122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190047454492900 + 30962647519281 = 13785770^2 + 5564409^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010102012181 - 2¹⁵ = 221010101979413 is a prime.

It is a super-2 number, since 2×221010102012181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221010102012281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505051006090 + 110505051006091.

It is an arithmetic number, because the mean of its divisors is an integer number (110505051006091).

Almost surely, 2^{221010102012181} is an apocalyptic number.

It is an amenable number.

221010102012181 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010102012181 is an equidigital number, since it uses as much as digits as its factorization.

221010102012181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 221010102012181 in words is "two hundred twenty-one trillion, ten billion, one hundred two million, twelve thousand, one hundred eighty-one".