211002000021 has 24 divisors (see below), whose sum is σ = 311197573440. Its totient is φ = 137737043136.

The previous prime is 211002000007. The next prime is 211002000029. The reversal of 211002000021 is 120000200112.

It is not a de Polignac number, because 211002000021 - 2¹⁴ = 211001983637 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211001999967 and 211002000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211002000029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1196251 + ... + 1361256.

It is an arithmetic number, because the mean of its divisors is an integer number (12966565560).

Almost surely, 2^211002000021 is an apocalyptic number.

It is an amenable number.

211002000021 is a deficient number, since it is larger than the sum of its proper divisors (100195573419).

211002000021 is a wasteful number, since it uses less digits than its factorization.

211002000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557705 (or 2557702 counting only the distinct ones).

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

Adding to 211002000021 its reverse (120000200112), we get a palindrome (331002200133).

The spelling of 211002000021 in words is "two hundred eleven billion, two million, twenty-one", and thus it is an aban number.