21200221021037 has 2 divisors, whose sum is σ = 21200221021038. Its totient is φ = 21200221021036.

The previous prime is 21200221021009. The next prime is 21200221021069. The reversal of 21200221021037 is 73012012200212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21018428791396 + 181792229641 = 4584586^2 + 426371^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200221021037 - 2²⁰ = 21200219972461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200221021537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600110510518 + 10600110510519.

It is an arithmetic number, because the mean of its divisors is an integer number (10600110510519).

Almost surely, 2^{21200221021037} is an apocalyptic number.

It is an amenable number.

21200221021037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200221021037 is an equidigital number, since it uses as much as digits as its factorization.

21200221021037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21200221021037 its reverse (73012012200212), we get a palindrome (94212233221249).

The spelling of 21200221021037 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, twenty-one thousand, thirty-seven".