121620959237 has 4 divisors (see below), whose sum is σ = 123614745516. Its totient is φ = 119627172960.

The previous prime is 121620959231. The next prime is 121620959287. The reversal of 121620959237 is 732959026121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68576420641 + 53044538596 = 261871^2 + 230314^2 .

It is a cyclic number.

It is not a de Polignac number, because 121620959237 - 2²⁰ = 121619910661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121620959191 and 121620959200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620959231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996893048 + ... + 996893169.

It is an arithmetic number, because the mean of its divisors is an integer number (30903686379).

Almost surely, 2^121620959237 is an apocalyptic number.

It is an amenable number.

121620959237 is a deficient number, since it is larger than the sum of its proper divisors (1993786279).

121620959237 is an equidigital number, since it uses as much as digits as its factorization.

121620959237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993786278.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 121620959237 in words is "one hundred twenty-one billion, six hundred twenty million, nine hundred fifty-nine thousand, two hundred thirty-seven".