21210011011 has 64 divisors (see below), whose sum is σ = 26568622080. Its totient is φ = 16531931520.

The previous prime is 21210010937. The next prime is 21210011023. The reversal of 21210011011 is 11011001212.

It is a cyclic number.

It is not a de Polignac number, because 21210011011 - 2²⁷ = 21075793283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210011041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95112046 + ... + 95112268.

It is an arithmetic number, because the mean of its divisors is an integer number (415134720).

Almost surely, 2^21210011011 is an apocalyptic number.

21210011011 is a deficient number, since it is larger than the sum of its proper divisors (5358611069).

21210011011 is a wasteful number, since it uses less digits than its factorization.

21210011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21210011011 its reverse (11011001212), we get a palindrome (32221012223).

The spelling of 21210011011 in words is "twenty-one billion, two hundred ten million, eleven thousand, eleven".