20021210210137 has 2 divisors, whose sum is σ = 20021210210138. Its totient is φ = 20021210210136.

The previous prime is 20021210210123. The next prime is 20021210210251. The reversal of 20021210210137 is 73101201212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15596346506841 + 4424863703296 = 3949221^2 + 2103536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021210210137 - 2⁷ = 20021210210009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021210210737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010605105068 + 10010605105069.

It is an arithmetic number, because the mean of its divisors is an integer number (10010605105069).

Almost surely, 2^{20021210210137} is an apocalyptic number.

It is an amenable number.

20021210210137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021210210137 is an equidigital number, since it uses as much as digits as its factorization.

20021210210137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 20021210210137 its reverse (73101201212002), we get a palindrome (93122411422139).

The spelling of 20021210210137 in words is "twenty trillion, twenty-one billion, two hundred ten million, two hundred ten thousand, one hundred thirty-seven".