221232118015949 has 2 divisors, whose sum is σ = 221232118015950. Its totient is φ = 221232118015948.

The previous prime is 221232118015919. The next prime is 221232118016027. The reversal of 221232118015949 is 949510811232122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197644515132100 + 23587602883849 = 14058610^2 + 4856707^2 .

It is a cyclic number.

It is not a de Polignac number, because 221232118015949 - 2²⁸ = 221231849580493 is a prime.

It is a super-2 number, since 2×221232118015949² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221232118015897 and 221232118015906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221232118015919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110616059007974 + 110616059007975.

It is an arithmetic number, because the mean of its divisors is an integer number (110616059007975).

Almost surely, 2^{221232118015949} is an apocalyptic number.

It is an amenable number.

221232118015949 is a deficient number, since it is larger than the sum of its proper divisors (1).

221232118015949 is an equidigital number, since it uses as much as digits as its factorization.

221232118015949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 221232118015949 in words is "two hundred twenty-one trillion, two hundred thirty-two billion, one hundred eighteen million, fifteen thousand, nine hundred forty-nine".