20121137 has 2 divisors, whose sum is σ = 20121138. Its totient is φ = 20121136.

The previous prime is 20121121. The next prime is 20121169. The reversal of 20121137 is 73112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13366336 + 6754801 = 3656^2 + 2599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121137 - 2⁴ = 20121121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20121107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060568 + 10060569.

It is an arithmetic number, because the mean of its divisors is an integer number (10060569).

Almost surely, 2^20121137 is an apocalyptic number.

It is an amenable number.

20121137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121137 is an equidigital number, since it uses as much as digits as its factorization.

20121137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 20121137 is about 4485.6590374214. The cubic root of 20121137 is about 271.9886862725.

Adding to 20121137 its reverse (73112102), we get a palindrome (93233239).

The spelling of 20121137 in words is "twenty million, one hundred twenty-one thousand, one hundred thirty-seven".