20121100101197 has 2 divisors, whose sum is σ = 20121100101198. Its totient is φ = 20121100101196.

The previous prime is 20121100101181. The next prime is 20121100101229. The reversal of 20121100101197 is 79110100112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10827692978116 + 9293407123081 = 3290546^2 + 3048509^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121100101197 - 2⁴ = 20121100101181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121100101097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060550050598 + 10060550050599.

It is an arithmetic number, because the mean of its divisors is an integer number (10060550050599).

Almost surely, 2^{20121100101197} is an apocalyptic number.

It is an amenable number.

20121100101197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121100101197 is an equidigital number, since it uses as much as digits as its factorization.

20121100101197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 26.

Adding to 20121100101197 its reverse (79110100112102), we get a palindrome (99231200213299).

The spelling of 20121100101197 in words is "twenty trillion, one hundred twenty-one billion, one hundred million, one hundred one thousand, one hundred ninety-seven".