121021200689 has 2 divisors, whose sum is σ = 121021200690. Its totient is φ = 121021200688.

The previous prime is 121021200673. The next prime is 121021200721. The reversal of 121021200689 is 986002120121.

It is an a-pointer prime, because the next prime (121021200721) can be obtained adding 121021200689 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117574923664 + 3446277025 = 342892^2 + 58705^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021200689 - 2⁴ = 121021200673 is a prime.

It is a super-2 number, since 2×121021200689² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121021202689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510600344 + 60510600345.

It is an arithmetic number, because the mean of its divisors is an integer number (60510600345).

Almost surely, 2^121021200689 is an apocalyptic number.

It is an amenable number.

121021200689 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021200689 is an equidigital number, since it uses as much as digits as its factorization.

121021200689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 121021200689 in words is "one hundred twenty-one billion, twenty-one million, two hundred thousand, six hundred eighty-nine".