211092021 has 16 divisors (see below), whose sum is σ = 357404800. Its totient is φ = 120623904.

The previous prime is 211092019. The next prime is 211092041. The reversal of 211092021 is 120290112.

It is not a de Polignac number, because 211092021 - 2¹ = 211092019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211091985 and 211092003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211092041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558256 + ... + 558633.

It is an arithmetic number, because the mean of its divisors is an integer number (22337800).

Almost surely, 2^211092021 is an apocalyptic number.

211092021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211092021 is a deficient number, since it is larger than the sum of its proper divisors (146312779).

211092021 is a wasteful number, since it uses less digits than its factorization.

211092021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116905 (or 1116899 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 211092021 is about 14529.0061945062. The cubic root of 211092021 is about 595.4207141490.

The spelling of 211092021 in words is "two hundred eleven million, ninety-two thousand, twenty-one".