11212203561 has 16 divisors (see below), whose sum is σ = 16654733760. Its totient is φ = 6661892160.

The previous prime is 11212203559. The next prime is 11212203623. The reversal of 11212203561 is 16530221211.

It is a happy number.

It is not a de Polignac number, because 11212203561 - 2¹ = 11212203559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11212203551) 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, 4955635 + ... + 4957896.

It is an arithmetic number, because the mean of its divisors is an integer number (1040920860).

Almost surely, 2^11212203561 is an apocalyptic number.

It is an amenable number.

11212203561 is a deficient number, since it is larger than the sum of its proper divisors (5442530199).

11212203561 is a wasteful number, since it uses less digits than its factorization.

11212203561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913576.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 11212203561 its reverse (16530221211), we get a palindrome (27742424772).

The spelling of 11212203561 in words is "eleven billion, two hundred twelve million, two hundred three thousand, five hundred sixty-one".