221684342149 has 2 divisors, whose sum is σ = 221684342150. Its totient is φ = 221684342148.

The previous prime is 221684342101. The next prime is 221684342167. The reversal of 221684342149 is 941243486122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221635691524 + 48650625 = 470782^2 + 6975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221684342149 is a prime.

It is a super-3 number, since 3×221684342149³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221684342099 and 221684342108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221684342549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110842171074 + 110842171075.

It is an arithmetic number, because the mean of its divisors is an integer number (110842171075).

Almost surely, 2^221684342149 is an apocalyptic number.

It is an amenable number.

221684342149 is a deficient number, since it is larger than the sum of its proper divisors (1).

221684342149 is an equidigital number, since it uses as much as digits as its factorization.

221684342149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 46.

The spelling of 221684342149 in words is "two hundred twenty-one billion, six hundred eighty-four million, three hundred forty-two thousand, one hundred forty-nine".