211113021 has 48 divisors (see below), whose sum is σ = 361874304. Its totient is φ = 108573696.

The previous prime is 211113017. The next prime is 211113029. The reversal of 211113021 is 120311112.

211113021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211113021 - 2² = 211113017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211112988 and 211113006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211113029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55641 + ... + 59313.

It is an arithmetic number, because the mean of its divisors is an integer number (7539048).

Almost surely, 2^211113021 is an apocalyptic number.

211113021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211113021 is a deficient number, since it is larger than the sum of its proper divisors (150761283).

211113021 is a wasteful number, since it uses less digits than its factorization.

211113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730 (or 3723 counting only the distinct ones).

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

The square root of 211113021 is about 14529.7288687711. The cubic root of 211113021 is about 595.4404581771.

Adding to 211113021 its reverse (120311112), we get a palindrome (331424133).

The spelling of 211113021 in words is "two hundred eleven million, one hundred thirteen thousand, twenty-one".