21212000011 has 4 divisors (see below), whose sum is σ = 21212956800. Its totient is φ = 21211043224.

The previous prime is 21211999979. The next prime is 21212000021. The reversal of 21212000011 is 11000021212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212000011 - 2⁵ = 21211999979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212000021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444331 + ... + 489748.

It is an arithmetic number, because the mean of its divisors is an integer number (5303239200).

Almost surely, 2^21212000011 is an apocalyptic number.

21212000011 is a deficient number, since it is larger than the sum of its proper divisors (956789).

21212000011 is an equidigital number, since it uses as much as digits as its factorization.

21212000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956788.

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

Adding to 21212000011 its reverse (11000021212), we get a palindrome (32212021223).

The spelling of 21212000011 in words is "twenty-one billion, two hundred twelve million, eleven", and thus it is an aban number.