20121097 has 2 divisors, whose sum is σ = 20121098. Its totient is φ = 20121096.

The previous prime is 20121091. The next prime is 20121103. The reversal of 20121097 is 79012102.

It is a balanced prime because it is at equal distance from previous prime (20121091) and next prime (20121103).

It can be written as a sum of positive squares in only one way, i.e., 18800896 + 1320201 = 4336^2 + 1149^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121097 - 2¹¹ = 20119049 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060548 + 10060549.

It is an arithmetic number, because the mean of its divisors is an integer number (10060549).

Almost surely, 2^20121097 is an apocalyptic number.

It is an amenable number.

20121097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121097 is an equidigital number, since it uses as much as digits as its factorization.

20121097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20121097 is about 4485.6545787655. The cubic root of 20121097 is about 271.9885060382.

Adding to 20121097 its reverse (79012102), we get a palindrome (99133199).

The spelling of 20121097 in words is "twenty million, one hundred twenty-one thousand, ninety-seven".