21000000210037 has 2 divisors, whose sum is σ = 21000000210038. Its totient is φ = 21000000210036.

The previous prime is 21000000210011. The next prime is 21000000210047. The reversal of 21000000210037 is 73001200000012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20646354718276 + 353645491761 = 4543826^2 + 594681^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000000210037 - 2³⁵ = 20965640471669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000000210037.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000000210047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500000105018 + 10500000105019.

It is an arithmetic number, because the mean of its divisors is an integer number (10500000105019).

Almost surely, 2^{21000000210037} is an apocalyptic number.

It is an amenable number.

21000000210037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000000210037 is an equidigital number, since it uses as much as digits as its factorization.

21000000210037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

Adding to 21000000210037 its reverse (73001200000012), we get a palindrome (94001200210049).

The spelling of 21000000210037 in words is "twenty-one trillion, two hundred ten thousand, thirty-seven".