211020913 has 4 divisors (see below), whose sum is σ = 211355968. Its totient is φ = 210685860.

The previous prime is 211020911. The next prime is 211020917. The reversal of 211020913 is 319020112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211020913 - 2¹ = 211020911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211020911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166581 + ... + 167842.

It is an arithmetic number, because the mean of its divisors is an integer number (52838992).

Almost surely, 2^211020913 is an apocalyptic number.

It is an amenable number.

211020913 is a deficient number, since it is larger than the sum of its proper divisors (335055).

211020913 is an equidigital number, since it uses as much as digits as its factorization.

211020913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335054.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 211020913 is about 14526.5588836448. The cubic root of 211020913 is about 595.3538492640.

The spelling of 211020913 in words is "two hundred eleven million, twenty thousand, nine hundred thirteen".