11561021207 has 8 divisors (see below), whose sum is σ = 12539644992. Its totient is φ = 10615571200.

The previous prime is 11561021191. The next prime is 11561021209. The reversal of 11561021207 is 70212016511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11561021207 - 2⁴ = 11561021191 is a prime.

It is a super-2 number, since 2×11561021207² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561021209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8292719 + ... + 8294112.

It is an arithmetic number, because the mean of its divisors is an integer number (1567455624).

Almost surely, 2^11561021207 is an apocalyptic number.

11561021207 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11561021207 is a deficient number, since it is larger than the sum of its proper divisors (978623785).

11561021207 is a wasteful number, since it uses less digits than its factorization.

11561021207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16586889.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 11561021207 its reverse (70212016511), we get a palindrome (81773037718).

The spelling of 11561021207 in words is "eleven billion, five hundred sixty-one million, twenty-one thousand, two hundred seven".