121420661 has 2 divisors, whose sum is σ = 121420662. Its totient is φ = 121420660.

The previous prime is 121420603. The next prime is 121420667. The reversal of 121420661 is 166024121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65918161 + 55502500 = 8119^2 + 7450^2 .

It is a cyclic number.

It is not a de Polignac number, because 121420661 - 2¹⁰ = 121419637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121420667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60710330 + 60710331.

It is an arithmetic number, because the mean of its divisors is an integer number (60710331).

Almost surely, 2^121420661 is an apocalyptic number.

It is an amenable number.

121420661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121420661 is an equidigital number, since it uses as much as digits as its factorization.

121420661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 121420661 is about 11019.1043646932. The cubic root of 121420661 is about 495.1812566145.

Adding to 121420661 its reverse (166024121), we get a palindrome (287444782).

The spelling of 121420661 in words is "one hundred twenty-one million, four hundred twenty thousand, six hundred sixty-one".