211002021 has 12 divisors (see below), whose sum is σ = 305777472. Its totient is φ = 140207976.

The previous prime is 211002013. The next prime is 211002037. The reversal of 211002021 is 120200112.

It is not a de Polignac number, because 211002021 - 2³ = 211002013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 211001994 and 211002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211002061) 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 in 11 ways as a sum of consecutive naturals, for example, 35421 + ... + 40946.

It is an arithmetic number, because the mean of its divisors is an integer number (25481456).

Almost surely, 2^211002021 is an apocalyptic number.

It is an amenable number.

211002021 is a deficient number, since it is larger than the sum of its proper divisors (94775451).

211002021 is a wasteful number, since it uses less digits than its factorization.

211002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76680 (or 76677 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 211002021 is about 14525.9086118563. The cubic root of 211002021 is about 595.3360820509.

Adding to 211002021 its reverse (120200112), we get a palindrome (331202133).

The spelling of 211002021 in words is "two hundred eleven million, two thousand, twenty-one".