101219221 has 2 divisors, whose sum is σ = 101219222. Its totient is φ = 101219220.

The previous prime is 101219179. The next prime is 101219243. The reversal of 101219221 is 122912101.

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., 53802225 + 47416996 = 7335^2 + 6886^2 .

It is a cyclic number.

It is not a de Polignac number, because 101219221 - 2¹³ = 101211029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101219281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50609610 + 50609611.

It is an arithmetic number, because the mean of its divisors is an integer number (50609611).

Almost surely, 2^101219221 is an apocalyptic number.

It is an amenable number.

101219221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101219221 is an equidigital number, since it uses as much as digits as its factorization.

101219221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 101219221 is about 10060.7763616930. The cubic root of 101219221 is about 466.0376427070.

The spelling of 101219221 in words is "one hundred one million, two hundred nineteen thousand, two hundred twenty-one".