11217891237 has 16 divisors (see below), whose sum is σ = 17132881920. Its totient is φ = 6395616432.

The previous prime is 11217891233. The next prime is 11217891253. The reversal of 11217891237 is 73219871211.

It is not a de Polignac number, because 11217891237 - 2² = 11217891233 is a prime.

It is a super-2 number, since 2×11217891237² (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 (11217891233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 599193 + ... + 617630.

It is an arithmetic number, because the mean of its divisors is an integer number (1070805120).

Almost surely, 2^11217891237 is an apocalyptic number.

It is an amenable number.

11217891237 is a deficient number, since it is larger than the sum of its proper divisors (5914990683).

11217891237 is a wasteful number, since it uses less digits than its factorization.

11217891237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217272.

The product of its digits is 42336, while the sum is 42.

The spelling of 11217891237 in words is "eleven billion, two hundred seventeen million, eight hundred ninety-one thousand, two hundred thirty-seven".