211013021 has 2 divisors, whose sum is σ = 211013022. Its totient is φ = 211013020.

The previous prime is 211013003. The next prime is 211013041. The reversal of 211013021 is 120310112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144264121 + 66748900 = 12011^2 + 8170^2 .

It is a cyclic number.

It is not a de Polignac number, because 211013021 - 2⁶ = 211012957 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211012993 and 211013011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211013041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105506510 + 105506511.

It is an arithmetic number, because the mean of its divisors is an integer number (105506511).

Almost surely, 2^211013021 is an apocalyptic number.

It is an amenable number.

211013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211013021 is an equidigital number, since it uses as much as digits as its factorization.

211013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 211013021 is about 14526.2872407233. The cubic root of 211013021 is about 595.3464272648.

Adding to 211013021 its reverse (120310112), we get a palindrome (331323133).

The spelling of 211013021 in words is "two hundred eleven million, thirteen thousand, twenty-one".