20121337 has 2 divisors, whose sum is σ = 20121338. Its totient is φ = 20121336.

The previous prime is 20121307. The next prime is 20121347. The reversal of 20121337 is 73312102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10361961 + 9759376 = 3219^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121337 - 2¹¹ = 20119289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060668 + 10060669.

It is an arithmetic number, because the mean of its divisors is an integer number (10060669).

Almost surely, 2^20121337 is an apocalyptic number.

It is an amenable number.

20121337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121337 is an equidigital number, since it uses as much as digits as its factorization.

20121337 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 19.

The square root of 20121337 is about 4485.6813306342. The cubic root of 20121337 is about 271.9895874402.

Adding to 20121337 its reverse (73312102), we get a palindrome (93433439).

The spelling of 20121337 in words is "twenty million, one hundred twenty-one thousand, three hundred thirty-seven".