20111010121197 has 8 divisors (see below), whose sum is σ = 29794089068480. Its totient is φ = 13407340080780.

The previous prime is 20111010121123. The next prime is 20111010121217. The reversal of 20111010121197 is 79112101011102.

It is not a de Polignac number, because 20111010121197 - 2⁸ = 20111010120941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 744852226711 = 20111010121197 / (2 + 0 + 1 + 1 + 1 + 0 + 1 + 0 + 1 + 2 + 1 + 1 + 9 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111010121197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111010121897) 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, 372426113329 + ... + 372426113382.

It is an arithmetic number, because the mean of its divisors is an integer number (3724261133560).

Almost surely, 2^{20111010121197} is an apocalyptic number.

20111010121197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20111010121197 is a deficient number, since it is larger than the sum of its proper divisors (9683078947283).

20111010121197 is an equidigital number, since it uses as much as digits as its factorization.

20111010121197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744852226720 (or 744852226714 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 27.

Adding to 20111010121197 its reverse (79112101011102), we get a palindrome (99223111132299).

The spelling of 20111010121197 in words is "twenty trillion, one hundred eleven billion, ten million, one hundred twenty-one thousand, one hundred ninety-seven".