213101300021 has 2 divisors, whose sum is σ = 213101300022. Its totient is φ = 213101300020.

The previous prime is 213101300017. The next prime is 213101300059. The reversal of 213101300021 is 120003101312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165701914225 + 47399385796 = 407065^2 + 217714^2 .

It is a cyclic number.

It is not a de Polignac number, because 213101300021 - 2² = 213101300017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213101299969 and 213101300005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213101300821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106550650010 + 106550650011.

It is an arithmetic number, because the mean of its divisors is an integer number (106550650011).

Almost surely, 2^213101300021 is an apocalyptic number.

It is an amenable number.

213101300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213101300021 is an equidigital number, since it uses as much as digits as its factorization.

213101300021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 213101300021 its reverse (120003101312), we get a palindrome (333104401333).

The spelling of 213101300021 in words is "two hundred thirteen billion, one hundred one million, three hundred thousand, twenty-one".