21020221210207 has 2 divisors, whose sum is σ = 21020221210208. Its totient is φ = 21020221210206.

The previous prime is 21020221210201. The next prime is 21020221210259. The reversal of 21020221210207 is 70201212202012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020221210207 - 2³⁹ = 20470465396319 is a prime.

It is a super-3 number, since 3×21020221210207³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020221210201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510110605103 + 10510110605104.

It is an arithmetic number, because the mean of its divisors is an integer number (10510110605104).

Almost surely, 2^{21020221210207} is an apocalyptic number.

21020221210207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020221210207 is an equidigital number, since it uses as much as digits as its factorization.

21020221210207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21020221210207 its reverse (70201212202012), we get a palindrome (91221433412219).

The spelling of 21020221210207 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred seven".