20121111097 has 8 divisors (see below), whose sum is σ = 20465186976. Its totient is φ = 19778322432.

The previous prime is 20121111071. The next prime is 20121111119. The reversal of 20121111097 is 79011112102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121111097 is a prime.

It is a super-2 number, since 2×20121111097² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121111067) 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, 290248 + ... + 352825.

It is an arithmetic number, because the mean of its divisors is an integer number (2558148372).

Almost surely, 2^20121111097 is an apocalyptic number.

It is an amenable number.

20121111097 is a deficient number, since it is larger than the sum of its proper divisors (344075879).

20121111097 is an equidigital number, since it uses as much as digits as its factorization.

20121111097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643607.

The product of its (nonzero) digits is 252, while the sum is 25.

Adding to 20121111097 its reverse (79011112102), we get a palindrome (99132223199).

The spelling of 20121111097 in words is "twenty billion, one hundred twenty-one million, one hundred eleven thousand, ninety-seven".