1202000021009 has 2 divisors, whose sum is σ = 1202000021010. Its totient is φ = 1202000021008.

The previous prime is 1202000020967. The next prime is 1202000021011. The reversal of 1202000021009 is 9001200002021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 771700756225 + 430299264784 = 878465^2 + 655972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202000021009 - 2¹⁶ = 1201999955473 is a prime.

Together with 1202000021011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1202000021809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601000010504 + 601000010505.

It is an arithmetic number, because the mean of its divisors is an integer number (601000010505).

Almost surely, 2^{1202000021009} is an apocalyptic number.

It is an amenable number.

1202000021009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202000021009 is an equidigital number, since it uses as much as digits as its factorization.

1202000021009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 1202000021009 in words is "one trillion, two hundred two billion, twenty-one thousand, nine".