109901221 has 2 divisors, whose sum is σ = 109901222. Its totient is φ = 109901220.

The previous prime is 109901219. The next prime is 109901227. The reversal of 109901221 is 122109901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98604900 + 11296321 = 9930^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 109901221 - 2¹ = 109901219 is a prime.

Together with 109901219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109901227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54950610 + 54950611.

It is an arithmetic number, because the mean of its divisors is an integer number (54950611).

Almost surely, 2^109901221 is an apocalyptic number.

It is an amenable number.

109901221 is a deficient number, since it is larger than the sum of its proper divisors (1).

109901221 is an equidigital number, since it uses as much as digits as its factorization.

109901221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 109901221 is about 10483.3783199883. The cubic root of 109901221 is about 478.9985210386.

It can be divided in two parts, 10990 and 1221, that multiplied together give a triangular number (13418790 = T₅₁₈₀).

The spelling of 109901221 in words is "one hundred nine million, nine hundred one thousand, two hundred twenty-one".