21020220110137 has 2 divisors, whose sum is σ = 21020220110138. Its totient is φ = 21020220110136.

The previous prime is 21020220110039. The next prime is 21020220110159. The reversal of 21020220110137 is 73101102202012.

It is an a-pointer prime, because the next prime (21020220110159) can be obtained adding 21020220110137 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16685762602041 + 4334457508096 = 4084821^2 + 2081936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020220110137 is a prime.

It is a super-3 number, since 3×21020220110137³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020220210137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510110055068 + 10510110055069.

It is an arithmetic number, because the mean of its divisors is an integer number (10510110055069).

Almost surely, 2^{21020220110137} is an apocalyptic number.

It is an amenable number.

21020220110137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020220110137 is an equidigital number, since it uses as much as digits as its factorization.

21020220110137 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 21020220110137 its reverse (73101102202012), we get a palindrome (94121322312149).

The spelling of 21020220110137 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred ten thousand, one hundred thirty-seven".