121537021 has 2 divisors, whose sum is σ = 121537022. Its totient is φ = 121537020.

The previous prime is 121537001. The next prime is 121537051. The reversal of 121537021 is 120735121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62631396 + 58905625 = 7914^2 + 7675^2 .

It is a cyclic number.

It is not a de Polignac number, because 121537021 - 2⁹ = 121536509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121536983 and 121537001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121537001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60768510 + 60768511.

It is an arithmetic number, because the mean of its divisors is an integer number (60768511).

Almost surely, 2^121537021 is an apocalyptic number.

It is an amenable number.

121537021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121537021 is an equidigital number, since it uses as much as digits as its factorization.

121537021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 121537021 is about 11024.3830212851. The cubic root of 121537021 is about 495.3393870195.

The spelling of 121537021 in words is "one hundred twenty-one million, five hundred thirty-seven thousand, twenty-one".