11353421661 has 16 divisors (see below), whose sum is σ = 16369392384. Its totient is φ = 6972145664.

The previous prime is 11353421657. The next prime is 11353421663. The reversal of 11353421661 is 16612435311.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11353421661 - 2² = 11353421657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11353421663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2365860 + ... + 2370653.

It is an arithmetic number, because the mean of its divisors is an integer number (1023087024).

Almost surely, 2^11353421661 is an apocalyptic number.

It is an amenable number.

11353421661 is a deficient number, since it is larger than the sum of its proper divisors (5015970723).

11353421661 is a wasteful number, since it uses less digits than its factorization.

11353421661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736580.

The product of its digits is 12960, while the sum is 33.

Adding to 11353421661 its reverse (16612435311), we get a palindrome (27965856972).

The spelling of 11353421661 in words is "eleven billion, three hundred fifty-three million, four hundred twenty-one thousand, six hundred sixty-one".