21021000211 has 16 divisors (see below), whose sum is σ = 22012397568. Its totient is φ = 20049595200.

The previous prime is 21021000199. The next prime is 21021000223. The reversal of 21021000211 is 11200012012.

It is an interprime number because it is at equal distance from previous prime (21021000199) and next prime (21021000223).

It is a cyclic number.

It is not a de Polignac number, because 21021000211 - 2²⁹ = 20484129299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021007211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4313106 + ... + 4317976.

It is an arithmetic number, because the mean of its divisors is an integer number (1375774848).

Almost surely, 2^21021000211 is an apocalyptic number.

21021000211 is a deficient number, since it is larger than the sum of its proper divisors (991397357).

21021000211 is a wasteful number, since it uses less digits than its factorization.

21021000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6882.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21021000211 its reverse (11200012012), we get a palindrome (32221012223).

The spelling of 21021000211 in words is "twenty-one billion, twenty-one million, two hundred eleven", and thus it is an aban number.