21001000112237 has 2 divisors, whose sum is σ = 21001000112238. Its totient is φ = 21001000112236.

The previous prime is 21001000112207. The next prime is 21001000112263. The reversal of 21001000112237 is 73221100010012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20051221223881 + 949778888356 = 4477859^2 + 974566^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001000112237 - 2⁶ = 21001000112173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001000112207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500500056118 + 10500500056119.

It is an arithmetic number, because the mean of its divisors is an integer number (10500500056119).

Almost surely, 2^{21001000112237} is an apocalyptic number.

It is an amenable number.

21001000112237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001000112237 is an equidigital number, since it uses as much as digits as its factorization.

21001000112237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21001000112237 its reverse (73221100010012), we get a palindrome (94222100122249).

The spelling of 21001000112237 in words is "twenty-one trillion, one billion, one hundred twelve thousand, two hundred thirty-seven".