133909111621 has 2 divisors, whose sum is σ = 133909111622. Its totient is φ = 133909111620.

The previous prime is 133909111577. The next prime is 133909111649. The reversal of 133909111621 is 126111909331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132433399396 + 1475712225 = 363914^2 + 38415^2 .

It is a cyclic number.

It is not a de Polignac number, because 133909111621 - 2⁷ = 133909111493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133909811621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66954555810 + 66954555811.

It is an arithmetic number, because the mean of its divisors is an integer number (66954555811).

Almost surely, 2^133909111621 is an apocalyptic number.

It is an amenable number.

133909111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

133909111621 is an equidigital number, since it uses as much as digits as its factorization.

133909111621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 133909111621 in words is "one hundred thirty-three billion, nine hundred nine million, one hundred eleven thousand, six hundred twenty-one".