211012621 has 2 divisors, whose sum is σ = 211012622. Its totient is φ = 211012620.

The previous prime is 211012601. The next prime is 211012631. The reversal of 211012621 is 126210112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201952521 + 9060100 = 14211^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012621 - 2⁷ = 211012493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211012595 and 211012604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211012601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105506310 + 105506311.

It is an arithmetic number, because the mean of its divisors is an integer number (105506311).

Almost surely, 2^211012621 is an apocalyptic number.

It is an amenable number.

211012621 is a deficient number, since it is larger than the sum of its proper divisors (1).

211012621 is an equidigital number, since it uses as much as digits as its factorization.

211012621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 211012621 is about 14526.2734725738. The cubic root of 211012621 is about 595.3460510815.

Adding to 211012621 its reverse (126210112), we get a palindrome (337222733).

The spelling of 211012621 in words is "two hundred eleven million, twelve thousand, six hundred twenty-one".