121949101 has 2 divisors, whose sum is σ = 121949102. Its totient is φ = 121949100.

The previous prime is 121949099. The next prime is 121949119. The reversal of 121949101 is 101949121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110565225 + 11383876 = 10515^2 + 3374^2 .

It is an emirp because it is prime and its reverse (101949121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121949101 - 2¹ = 121949099 is a prime.

Together with 121949099, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121949101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121946101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60974550 + 60974551.

It is an arithmetic number, because the mean of its divisors is an integer number (60974551).

Almost surely, 2^121949101 is an apocalyptic number.

It is an amenable number.

121949101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121949101 is an equidigital number, since it uses as much as digits as its factorization.

121949101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 121949101 is about 11043.0566873488. The cubic root of 121949101 is about 495.8985834207.

The spelling of 121949101 in words is "one hundred twenty-one million, nine hundred forty-nine thousand, one hundred one".