21213000211 has 32 divisors (see below), whose sum is σ = 24329797632. Its totient is φ = 18344726400.

The previous prime is 21213000203. The next prime is 21213000223. The reversal of 21213000211 is 11200031212.

It is not a de Polignac number, because 21213000211 - 2³ = 21213000203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213000191 and 21213000200.

It is not an unprimeable number, because it can be changed into a prime (21213010211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18239316 + ... + 18240478.

It is an arithmetic number, because the mean of its divisors is an integer number (760306176).

Almost surely, 2^21213000211 is an apocalyptic number.

21213000211 is a deficient number, since it is larger than the sum of its proper divisors (3116797421).

21213000211 is a wasteful number, since it uses less digits than its factorization.

21213000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21213000211 its reverse (11200031212), we get a palindrome (32413031423).

The spelling of 21213000211 in words is "twenty-one billion, two hundred thirteen million, two hundred eleven", and thus it is an aban number.