211000020021 has 12 divisors (see below), whose sum is σ = 348317493472. Its totient is φ = 120571439976.

The previous prime is 211000020019. The next prime is 211000020041. The reversal of 211000020021 is 120020000112.

It is not a de Polignac number, because 211000020021 - 2¹ = 211000020019 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211000019985 and 211000020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211000020041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1674603271 + ... + 1674603396.

Almost surely, 2^211000020021 is an apocalyptic number.

211000020021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211000020021 is a deficient number, since it is larger than the sum of its proper divisors (137317473451).

211000020021 is a wasteful number, since it uses less digits than its factorization.

211000020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349206680 (or 3349206677 counting only the distinct ones).

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

Adding to 211000020021 its reverse (120020000112), we get a palindrome (331020020133).

The spelling of 211000020021 in words is "two hundred eleven billion, twenty thousand, twenty-one".