11211053505409 has 2 divisors, whose sum is σ = 11211053505410. Its totient is φ = 11211053505408.

The previous prime is 11211053505389. The next prime is 11211053505461. The reversal of 11211053505409 is 90450535011211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8229422477809 + 2981631027600 = 2868697^2 + 1726740^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211053505409 - 2²¹ = 11211051408257 is a prime.

It is a super-2 number, since 2×11211053505409² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11211053505469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605526752704 + 5605526752705.

It is an arithmetic number, because the mean of its divisors is an integer number (5605526752705).

Almost surely, 2^{11211053505409} is an apocalyptic number.

It is an amenable number.

11211053505409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211053505409 is an equidigital number, since it uses as much as digits as its factorization.

11211053505409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 11211053505409 in words is "eleven trillion, two hundred eleven billion, fifty-three million, five hundred five thousand, four hundred nine".