121221077 has 2 divisors, whose sum is σ = 121221078. Its totient is φ = 121221076.

The previous prime is 121221047. The next prime is 121221103. The reversal of 121221077 is 770122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117375556 + 3845521 = 10834^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221077 - 2⁶ = 121221013 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610538 + 60610539.

It is an arithmetic number, because the mean of its divisors is an integer number (60610539).

Almost surely, 2^121221077 is an apocalyptic number.

It is an amenable number.

121221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221077 is an equidigital number, since it uses as much as digits as its factorization.

121221077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 121221077 is about 11010.0443686663. The cubic root of 121221077 is about 494.9097914042.

Adding to 121221077 its reverse (770122121), we get a palindrome (891343198).

The spelling of 121221077 in words is "one hundred twenty-one million, two hundred twenty-one thousand, seventy-seven".